Long Bone Essay Example | Topics and Well Written Essays - 750 words

Long Bone - Essay Example Every column is composed of lamellae, concentric bony layers, regularly arranged in a manner determined by the distribution of blood vessels, lymphatics, and nerves supplying the bone. These three structures are bundled together in central channels, called Haversian canals, surrounded by lamellae. These canals connect with each other through Volkmann's canals, which breach them perpendicularly. (Young, 2000) In a long bone, the epiphyses are mainly composed of spongy bone, while on the other hand; in the diaphysis, only a thin layer of spongy bone lines the inner surface of the shaft (immediately surrounding the medullary cavity). This type of bone is composed of a network of irregular bony plates, called trabeculae, separated from each other by a maze of intercommunicating spaces filled with bone marrow. These trabeculae consist of irregular lamellae with lacunae composed of osteocytes, which help in bone nutrition. They are also lined with a fine tissue layer, the endosteum, which contains osteoprogenitor cells, osteoblasts, and osteoclasts. (Young, 2000) It is the large central cavity of a long bone that is mostly occupied by spongy bone. In premature beings, the cavities of most bones contain red (active) bone marrow that is responsible for the production of blood cells. In adults, red marrow is found only on specific sites while the rest of the cavity is filled with yellow (inactive) marrow, which is mostly adipose tissue. (Young, 2000) Nutrient Foramen: It is the outer opening of the nutrient canal in the shaft of a long bone. It is the point on the bone for the entrance of the nutrient artery, which is responsible for the blood supply to the medullary cavity of the long bone. (OMD, 2000) Diaphysis: Ossification progressively spreads from the primary center of ossification, i.e. the center of the long bone, towards the ends of the bone. The part of the long bone that develops from the primary center, that is, the shaft, is known as diaphysis. (Young, 2000) Epiphyses: At the secondary centers of ossification, located at the cartilaginous ends of the developing bone, cartilage is replaced by bone in the same way as it occurs at the primary centers. Parts of bone that develop from these centers, that is, the ends, are known as epiphyses. Proximal epiphyses refers to the end that grows towards the primary center, while distal epiphyses refers to the end that grows away from the primary center. (Young, 2000) Epiphyseal Plate: It is the plate of cartilage intervening between the diaphysis and epiphyses. This plate is responsible for the elongation of the bone during childhood and early adulthood through constant proliferation of the cartilage. At maturity, this plate is replaced by bone resulting in the fusion of the epiphyses and diaphysis. (Young, 2000) Epiphyseal Line: The junction of the epiphyses and diaphysis indicated later in life by a faint ridge on the outer surface of the long bone is called the Epiphyseal line. (Young, 2000) Articular Cartilage: It is a specialized hyaline cartilage that covers the articulating bone surfaces within the joints. Hence, it is responsible for the smooth movement of bones against one another in a joint.

Project Management and Virtual Teams Essay Example for Free

Project Management and Virtual Teams Essay Athabasca University Abstract Due to advanced communication technologies, globalization and outsourcing most of the project management teams are based on groups of individuals called virtual teams who work across time and space using communication technologies. Members of virtual teams may be employees of same company from same country, or they can be contractors, suppliers and company employees around the globe. Managing projects using virtual teams have some advantages and disadvantages. Also several studies have been done to try to determine the factors that are positively co-related to the effectiveness of virtual teams (Schwalbe, 2011). To manage virtual teams successfully in project management, the project manager must manage these factors successfully and also minimize the impact of disadvantages. This paper discusses the advantages and disadvantages of the virtual teams in project management and outlines the factors that are positively correlated to the success of projects based on virtual teams. The paper also outlines some of the recommendations to successfully manage the virtual team in information technology projects. Keywords Globalization, outsourcing, virtual teams, video conferencing, telecommuting, Project Management, Trust and relationship, Advantages of Virtual teams, Disadvantages of virtual team. Introduction Imagine that you are a project manager in a multinational organization and managing a project to upgrade the server operating system and your team members are from different countries with different cultures and working in different time zones. To complete the project successfully that is based on virtual teams, project manager must understand the advantages and disadvantages of managing virtual teams and factors that positively affect the team members. Today most of the project management teams are based on virtual teams whose members work across time and space using communication technologies and project managers cannot rely on previous methods of project team management where they were able to build trust between team member by social interaction, face-to-face meetings, and direct observations of fellow team member commitment. Literature Review Virtual teams do have some advantages and disadvantages. Some of the advantages outlined by Kathy Schwalbe are: 24/7 availability of workers increasing competiveness and responsiveness, lowering the cost of project as many virtual team members do not need office space and support, providing more flexibility and expertise as project managers have access to the talent around the globe and increasing the work/life balance for team members by eliminating fixed office hours and the need to travel to work. (Schwalbe, 2011). Communication and trust are the most important factors that influence the virtual team performance. Saonee Sarker and others discussed the â€Å"theoretical linkages among trust, communication, and team member performance in virtual teams†. (Sarker1, Ajuja, Sarker, Kirkeby, 2001). To prove their argument the researchers identified and tested three proposed models (additive, interaction, and mediation) describing the role of trust in its relationship. The results of the study indicated that the â€Å"mediating† model best explains how communication and trust work together to influence the performance of virtual team members. In simple words them study proves that â€Å"a communicative individual will be more likely to be trusted and will therefore be more likely to be a high performer†. (Sarker1, Ajuja, Sarker, Kirkeby, 2001) Radostina K. Purvanova reviewed experimental literature and emerging field research on virtual teams. Author compared the â€Å"results from both type of literature and found that experimental literature has largely reported negative results for virtual teams, whereas ? eld investigations and case studies of real virtual teams employed by business organizations report positive outcomes for virtual teams. According to the article although results reported by experimental versus field studies are quite different, author concludes that both literatures have revealed negative attitudes toward virtual communication media. Advantages of Virtual Teams The main advantages of virtual teams include: The biggest advantage of virtual team enjoyed by an organization is the associated cost savings. The organization can save huge expenses on real estate, office spaces, utility bills such as gas, electricity, water etc. and executive’s travel. Team members can work from anywhere and anytime of the day. They can choose the place they work based on the mood and the comfort. You can recruit people for their skills and suitability to the job. The location does not matter. There is no time and money wasted for commuting and clothing. Physical handicaps are not an issue. Another advantage is the labour laws, some organizations prefer to have virtual teams because of strict local labour laws. Since the members span the time zones, there could be different team working on the same project 24/7, so when one member sleeps there will be another one somewhere else who would start work where the former had left. This shortens the product development time as well as faster response time to demands in both global and local markets. Disadvantages of Virtual Teams Disadvantages of virtual teams include: Since team members do not frequently meet or do not meet at all, the teamwork spirit may not be present. Some people prefer to be in a physical office when working. These people will be less productive in virtual environments. To work for virtual teams, individuals need to have a lot of self-discipline. If the individual is not disciplined, he or she may be less productive. The cultural difference between the members of virtual teams gives rise to number of conflicts. For example, while an employee from one part of the world would write a straightforward email describing a bad situation; this would be perceived as impolite by a member of the team from other part of the world. This would lead to conflicts, mistrust and difficulties in fruitful collaboration which is so vital for the success of virtual team functioning. These challenges are also precipitated by the absence of non-verbal cues so intrinsic to face-to-face interactions. Many members of virtual teams are adversely affected by the lack of physical interactions. Most of the communications in virtual environment is task-oriented. In today’s society where job is an important social force for most of us because many of our workplace colleagues also constitute our close friends, this gives a not-so-good feeling of social isolation. This in turn counter-effects productivity as well as leads to stress. In the virtual environment, it is better to communicate, clarify, and confirm everything to make sure that all members have the same understanding about the task at hand. This produces of ton of paperwork and files that could quickly fill your archives. Factors that positively affect virtual teams Succession planning and promotions involving virtual team members are important factors and if managed properly, virtual team members will feel that they are receiving recognition and credit and as a result they will be satisfied and their productivity will be increased. (Leonard, 2011) Since team members are not communicating face to face, constructive team and individual feedback early and often becomes more important and if managed properly can avoid many problems before hand. Trust between team members and project leader is an important factor that can affect the performance of team members. One important way to build trust between team members is effective communication. The more they communicate with each other and with project more they build the trust. Well defined and documented team process also important which saves a lot of time for especially new team members to find answers to their questions related to policies and procedures. A team member selection and role preference is also important factor to successfully manage the virtual teams. â€Å"Dr. Meredith Belbin defined a team role as a tendency to behave, contribute and interrelate with others in a particular way. 15 It is important to select team members carefully and to form a team where all roles are covered. Each virtual team member must also understand his or her role(s) on the team. † (Schwalbe, 2011) Discussion and Conclusions Organizations such as IBM, Microsoft, Whirlpool as well as SMEs are reaping the benefits of virtual teams for some time now. It has been a well-recognized fact that virtual team is not a passing tide but it is here to stay. Virtual teams are rising in numbers nowadays and even small technology companies are now adapting virtual team practice for recruiting the best people from all over the globe and reduce the cost. As outlined in previous sections, virtual teams do have advantaged and some disadvantages as well. To benefit from advantages and to minimize the impact of disadvantages a project manager can focus on factors that positively affect the virtual team’s performance. As indicated by previous researchers, increase in trust, comfort level and communication effectiveness leads to better project success. All of the above discussed disadvantages can be overcome by following a different leadership approach, trainings, greater role clarity and effective communication strategies. Also earlier discussed factors that affect virtual teams, if managed properly can result in a successful project. In addition, the companies using virtual teams can minimize their operating costs and maximize the profit margins. Additionally, the employees working in virtual teams are at advantages when it comes to working in their own home, own time, and reduction of commuting costs. Therefore, organizations should look into setting up virtual teams for different tasks whenever possible. To reap the benefits of virtual teams in projects and minimize the impact of disadvantages virtual team managers should manage the outlined factors properly and should also follow best practices outlined in next section. Best Practices When running virtual teams, some of the best practices include: An instant messaging program can be used to create a sense of presence amongst members of the team. Chat is a good way to have side conversations during meetings to gain consensus, confirm understanding or ask questions. Quick questions can be asked through instant messenger as a substitute for popping into someone’s cubicle. Services for syncing files, bug tracking, project management, source control, web conferencing, conference calls, screen recording, usability testing and so on. A virtual phone system allows mapping of phone extensions to any phone number. Advance features allow callers to dial by name, get placed into a phone queue or get recorded answers back from a phone tree. In-person meetings are also a good option; it helps build team cohesion and trust and can help people get to know each other on a deeper level. But they are by no means critical. Bringing everyone together once a year may cost a little, but it’s still often cheaper than paying local salaries and rent, and increases the efficiency of team.

Corruption in the Church and Society Reflected in The Canterbury Tales :: Canterbury Tales Essays

Corruption in the Church and Society Reflected in The Canterbury Tales  Ã‚  Ã‚   In discussing Chaucer's collection of stories called The Canterbury Tales, an interesting picture or illustration of the Medieval Christian Church is presented. However, while people demanded more voice in the affairs of government, the church became corrupt -- this corruption also led to a more crooked society. Nevertheless, there is no such thing as just church history; This is because the church can never be studied in isolation, simply because it has always related to the social, economic and political context of the day. In history then, there is a two way process where the church has an influence on the rest of society and of course, society influences the church. This is naturally because it is the people from a society who make up the church....and those same people became the personalities that created these tales of a pilgrimmage to Canterbury.   Ã‚  Ã‚   The Christianization of Anglo-Saxon England was to take place in a relatively short period of time, but this was not because of the success of the Augustinian effort. Indeed, the early years of this mission had an ambivalence which shows in the number of people who hedged their bets by practicing both Christian and Pagan rites at the same time, and in the number of people who promptly apostatized when a Christian king died. There is certainly no evidence for a large-scale conversion of the common people to Christianity at this time. Augustine was not the most diplomatic of men, and managed to antagonize many people of power and influence in Britain, not least among them the native British churchmen, who had never been particularly eager to save the souls of the Anglo-Saxons who had brought such bitter times to their people. In their isolation, the British Church had maintained older ways of celebrated the major festivals of Christianity, and Augustine's effort to compel them to conform to modern Roman usage only angered them. When Augustine died (some time between 604 and 609 AD), then, Christianity had only a precarious hold on Anglo-Saxon England, a hold which was limited largely to a few in the aristocracy. Christianity was to become firmly established only as a result of Irish efforts, who from centers in Scotland and Northumbria made the common people Christian, and established on a firm basis the English Church. At all levels of society, belief in a god or gods was not a matter of choice, it was a matter of fact.

Human Movement Essay

Kinesiology, plainly put is the study of human movement and all aspects to it. It is the science of human movement. It is comprehensive in its outlook in that it looks at being part of the physical activity (the experience), class room study of the theories and concepts that make an activity qualify as physical (scholarly) and the professional practice connected with physical practice (Hoffman, 2009). It looks at the muscles-their make up and how they contribute to human movement, the skeleton-make up and contribution to human movement, and the brain in the same context as the previous two. It makes a practitioner of Kinesiology understand human movement from all angles – the why, what, when and which. Method: Since this study entails all aspects of the human movement, so to does its learning. The use of a high school football team was to allow sight of human movement in real time from a passive position. It brought in play the subjectivity of the human mind in the observational data collection aspect of the research. By its very nature football is a contact sport. It thus presented the research with the best tool to observe the different components that constitute human movement. The preconceived notions of the human mind would be make for interesting reading when tested against the scientific results. Since not all the three different components could be scientifically measured at the same time, the research was focused on the head. This is from the realization that head impacts result in concussions. This is an injury that has the very real possibility of ending ones career but also could end up in death. To best investigate the impact to head injuries, the research used the Head Impact Telemetry System (HITS). This is a wireless monitoring system capable to rapidly identify athletes who have sustained an impact to the helmet that has the potential of being injurious. It is made to produce real-time post impact data and transmit the results to a computer not more than 150 yd (137m) from the helmet via radio waves. When out of range, an onboard storage unit would record up to 100 hits and transmit when back on range. HITS allows for objectivity in the research. For Kinesiology, to qualify as a science, measurement must be precise and consistent. Head impact data was captured when a single accelerometer exceeded the preset 15g threshold. Data from 8 milliseconds pre to 32 milliseconds post impact was transmitted and stored. The dependent variables set were linear acceleration, rotational acceleration, jerk force, impulse and duration of impact. Results: From the data collected in the course of the season (68 sessions-55 practice days, 13 games), it became clear that, there were more impacts during games than during practice. The greatest number of knocks was experienced by defensive line players, offensive linemen, offensive skill players and defensive skill players in descending order. In ascending order, the location of helmet with most frequently hits was the top, side, back and front. Game situations resulted in higher linear acceleration than practice impacts. Top of the helmet hits had the greatest linear acceleration followed by front, back and side. Again, game time impacts caused more rotational acceleration than practice. The line players experienced harder hits than skill players in this category. It was also clear that most forceful hits were as a result of front then back then side and lowest top hit. Looking at head jerk, impact force, impact pulse and duration of the impact, the figures were higher during game times than practice. The offensive line and defensive skill players had an equal occurrence of head jerk but higher than the others. The line players had longer duration of impact, more impact impulse and force of impact than the skill players. Maximum head jerk and impact force was experienced as result of hits at the top followed by the front, back and side. For the duration of impact, the order was the same but in reverse role. Also noted, the harder a player was hit the higher the linear acceleration, maximum jerk, force and impulse. The same was true for a soft hit. Conclusion: From the research, this paper has been able to come to some conclusions as a result of the available data. Some of the conclusions justified the subjective view in the researcher at the beginning of the undertaking while some have resulted in the researchers’ change of perception. It was clear from the data that there were higher linear acceleration collisions in high schools than from statistics available about research done on colleges. This could be as a result of the kids wanting to impress. They clearly may not have and full knowledge of the consequences of their actions. In high schools the chance of a college scholarship, means one could have a greater chance of success in life as a result of the extra academic qualifications one acquired. The higher linear acceleration collisions have a higher concussive chance. This makes the high school football player more at risk as very few have compressive medical covers that would give them the kind of specialized treatment necessary should the worst happen. Schools by the nature of their medical cover can not to provide this. In high school, there were more top helmet impacts than in college. It meant a higher linear acceleration and also impact force magnitude. This was a very dangerous location. It exposed the boys to a higher risk of concussion and severe cervical injury. This could easily mean career ending injury, paralysis or even death. There was need for more effort to be put into coaching. They could help teach the boys proper tackling techniques and make them understand the advantage of keeping the head high and thus avoiding helmet contact. It could be that since the college players are more mature, they do not let blood to run into their heads. They are committed in their tackles and at the same time aware of what the consequences of their actions are if not watched properly. Since the boys in high school were still maturing, they were generally smaller in mass and height as compared to their college equivalent. The more reason why they needed to be taught well. In high school, the most dangerous positions were the Quarterback, running backs and wide receiver in decreasing severity. They had the highest linear acceleration impacts. These could be as a result of them been always in full flight (speed) and in open field. These is unlike their counterparts the offensive line and defensive skill players. These may have the highest number of hits on them but the impact is low. The reason could be because they were always near each other and they do not achieve full acceleration before getting hit. The guys who get hit all the time were line men. These guys were involved in every play in the field. Finally, in high school because of the small pool of players, some ended up playing more than one position. This increased the risk of injury. This research did raise some very pertinent issues. They need to have proper coaching in high schools should go along way in reducing the chances of serious injury in the field. Also, the better knowledge of head injury risks should make for better understanding of how to tackle and care for them should and when they occur. This research has given birth to invaluable knowledge for Kinesiologists.

Fidel Castro Psychobiography

Life Events of Fidel Castro The psychobiography to the life of Fidel Castro. Carl Jung divided his developmental theory into three parts: childhood, puberty to young adulthood and middle age. Carl Jung believed that â€Å"we develop and grow regardless of age and we are always moving toward a more complete level of self-realization† (Schultz & Schultz, 2009). I believed that parents have a big role in child’s development of personality; and they can shape the child personality through their influences.Fidel Castro was born one of several illegitimate children to prosperous sugar farmer Angel Castro y Argiz and his household maid Lina Ruz Gonzalez, on August 13, 1926. Fidel Castro is one of the world’s oldest dictators and in many ways the typical narcissistic oppressor. Theorists had tried to explain his behavior; however many accounts portray Castro to have been brought up in a supportive family even though he grew up with the stigma of being an illegitimate. â €Å"The ego begins to form substantively only when children become able to distinguish between themselves and other people† (Schultz & Schultz, 2009).He attended Roman Catholic boarding schools in Santiago de Cuba and High School in Havana, where he proved to be a talented student an outstanding athlete. In 1945 he entered Law School at the University of Havana and joined the Orthodox Party, which strive for economic independence, political liberty, social justice and an end to corruption. In 1947 Castro temporarily left the university and in 1948 he took part in urban riots in Bogota, Colombia. He returned to Havana, while being a student Castro married Mirta Diaz-Balart a philosophy student whose wealthy family had political ties to Cuban military leader Fulgencio Batista.In 1949 his first son was born but because he had no income to support the family the marriage ended. According to Jung, from â€Å"teenage years through young adulthood, we are concerned with completing activities such as education, beginning a career, marriage and family† (Schultz & Schultz, 2009). Castro as a lawyer, tried to mount legal challenge to Fulgencio Batista’s reign, demonstrating that the Cuban Constitution had been violated when the courts refused to hear his petition, Castro decided that legal attacks on Batista would never change.On July 26, 1953 Castro and his brother Raul, led about 160 men in a suicidal attack on the Moncada military barracks in Santiago de Cuba in hopes of generating a popular revolution, â€Å"The persona archetype a public face we wear to present ourselves as someone different from who we really are† (Schultz & Schultz, 2009). Most of the men were killed and Castro and his brother were captured and sentenced by the government to 15 years’ imprisonment. They were later released in a political amnesty and went to Mexico to continue to campaign against Batista regime.Castro began to make plans to return to Cuba, while i n Mexico he met Ernesto â€Å"Che† Guevara who was destined to play an important role in the Cuban Revolution. These rebels acquired weapons, trained and coordinated their return with fellow insurgents in Cuban cities. On December 2, 1956 Castro and armed expedition landed on the eastern coast of Cuba, they were detected and ambush and many of the rebels were killed. Castro and the other leaders survived and made it to the mountains and reminded there for a while attacking government forces and installations and organizing resistance cells in the cities across Cuba.With the help of revolutionary volunteers throughout the island, Fidel Castro’s forces won a string of victories over Batista government. As the undisputed revolutionary leader, Castro became commander in chief of the armed forces in Cuban government. Castro soon implemented a Soviet-style communist regime in Cuba, much to the dismay of the United States. This led to decades of conflict between Cuba and the USA including such incidents like The Cuban Missile Crisis and the Mariel boatlift.Castro survived countless assassination attempts, some of them crude and quite clever; the collective unconscious is â€Å"the universal memories and experiences of humankind, represented in the symbols, stories, and images â€Å"It is the collection of our experiences as a species, a kind of instinctual knowledge† (Schultz & Schultz, 2009). Cuba was placed under economic embargo which has had serious effect on the Cuban economy. â€Å"Introverts focus on their own thought and feelings. † (Zimbardo Pg. 392) They are not sociable and prefer to be alone.Extrovert people are more interested in the world and the things going on in it then in their own life. They are outgoing and friendly. They enjoy being in social situations. Jung claimed â€Å" few people have all pairs of forces in balance. Usually one is more dominant determining a person’s personality. † ( Zimbardo Pg. 39 2) As we can see, although Jung was influenced by Freud’s personality theory, but his personality theory focuses on parents’ influence on a child’s personality and ego. Carl Jung died in 1961.

Labeling Theory Essays - Criminology, Social Philosophy, Free Essays

Labeling Theory Essays - Criminology, Social Philosophy, Free Essays Labeling Theory Labeling Theory Labeling theory is associated with Howard Becket and was introduced in 1963. Labeling theory is the theory of deviance that views deviance as a label assigned to behavior and individuals by particular figures of authority. That means that no one is actually a deviant and no action is deviant unless specified by society. The acts that are considered deviant today, may be acceptable or even normal tomorrow or in another part of the world. This theory doesnt plausibly explain Nevet and Begonias behavior. Strain Theory French sociologist Emile Durkheim (1858 1917) used the term anomie to describe a state of normlessness in society, when many people are unclear as to the expectations others have of them (Durkheim, 1951). The importance of Durkheims study for an understanding of deviance is his focus on the way a society can actually create strains in the lives of its individual members. Anomie theory in essence states that deviant behavior is encouraged by strains builkt into the very fabric or society. Durkheims concept was borrowed from American sociologist Robert Merton in his study of deviance. Merton (1956) analyzed societal strains by pointing out the variety of ways that people might respond to such strain. As the strains occur in all walks of life so too do the (often-deviant) adaptations. The rebellion response to strain explains Nevet and Begonias action by offering that they were encouraged to act deviantly because there was so much strain of them to be perfect

ESL Present Perfect Worksheets

ESL Present Perfect Worksheets The present perfect isnt a verb tense unique to English, but it can still be complicated for beginning ESL students to master. Though French, Italian, German, and Spanish use the present perfect to address past events, in English, the present perfect connects a past moment to the present moment in time. The present perfect is often used either to reference life experiences, to invoke recent past events that have influenced the present moment, or to reference a span of time that began in the past and extends into the present. The present perfect is one of the most difficult tenses to teach and to learn. Below is a quick review of the present perfect, followed by two worksheets designed to help ESL students practice their use of the verb tense. Present Perfect Positive Form Review Subject have   past participle objects Examples: Tom has lived in New York for 10 years.We have studied French since 2003. Present Perfect Negative Form Subject have not past participle objects Examples: She hasnt met Peter.They havent finished the job yet. Present Perfect Question Form (Question Word) have subject past participle? Examples: Has she worked here for a long time?Where has she gone? Important Note:  Regular past participles in -ed, irregular past participles of verbs vary and must be studied. Yet / Just / Already Yet is used in the present perfect negative and question forms.Just is used in the present perfect positive form.Already is used in the present perfect positive form. Examples: Have you finished the job yet?Shes just left for Chicago.Theyve already eaten lunch. Since / For Since and for are common time expressions used with the present perfect tense. Since is used with specific dates. For is used with periods of time. Examples: Janet has worked at this company since 1997.Weve lived in this house for five years. Present Perfect Worksheet 1 Conjugate the verb in parentheses using the form indicated. In the case of questions, use the indicated subject as well. How long ______ (he/live) in New Jersey?Peter ______ (not play) baseball since 1987.I ______ (speak) Russian for 20 years.We _____ (not see) Tom since Christmas.Has ________ (Alan/fly) in an airplane before?Shannon _____ (not/go) to lunch yet.Our class _____ (take) a field trip three times this year.Where _____ (they/move) to?Jennifer _____ (ask) that question four times today.You _____ (not eat) lunch yet, have you?Jason _____ (want) to move to New York since he was 5 years old.How long _____ (they/know) Peter?Alexandra _____ (work) for IBM since 2002.Jeff _____ (buy) a few books this week.Sally ______ (not read) that book yet._____ (they/leave) for work yet?Bill _____ (not/drive) very far today.We _____ (enjoy) eating seafood all of our lives._____ (he/watch) the documentary yet?I _____ (not/finish) the job yet. Present Perfect Worksheet 2 Choose the correct time expression used with the present perfect tense. They have lived in that house (since/for) 10 years.She has (just/yet) gone to the bank.Franklin hasnt arrived in Boston (yet/already)We have worked at this company (since/for) 2008.Jason hasnt telephoned me (since/for) two weeks.How (long/much) have you known Susan?Theyve (already/yet) studied the past simple tense.Our mothers have (just/yet) left for the station.The president has traveled to more than 20 countries (since/for) he was elected.Thomas hasnt had time to read the book (just/yet).Alice has told me shes (yet/already) been to that park.My daughters (just/since) finished her homework.Have they (already/yet) spoken to Mr. Peters?Ive (just/for) interviewed the best candidate for the job.Our coach hasnt chosen the starting team (already/yet).Bob and Tim have (already/yet) decided where they are going on vacation.Have you purchased a new computer (just/yet)?Sam has wanted to go to Japan (for/since) he was a little child.Jason hasnt worked here (since/for) very long.Our boss has ( just/yet) hired a new engineer. _______________________________________________________________________________ Present Perfect Worksheet  1 - Corrections Conjugate the verb in parentheses using the form indicated. In the case of questions, use the indicated subject as well. How long  has he lived  in New Jersey?Peter  hasnt played baseball  since 1987.I  have spoken  Russian for 20 years.We  havent seen  Tom since Christmas.Has Alan flown  in an airplane before?Shannon  hasnt gone  to lunch yet.Our class  has taken  a field trip three times this year.Where  have they moved  to?Jennifer  has asked  that question four times today.You  havent eaten  lunch yet, have you?Jason  has wanted  to move to New York since he was 5 years old.How long  have they known  Peter?Alexandra  has worked  for IBM since 2002.Jeff  has bought  a few books this week.Sally  hasnt read  that book yet.Have they left  for work yet?Bill  hasnt driven  very far today.We  have enjoyed  eating seafood all of our lives.Has he watched  the documentary yet?I  havent finished  the job yet. Present Perfect Worksheet 2 - Corrections Choose the correct time expression used with the present perfect tense. They have lived in that house  for  10 years.She has  just  gone to the bank.Franklin hasnt arrived in Boston  yet.We have worked at this company  since  2008.Jason hasnt telephoned me  for  two weeks.How  long  have you known Susan?Theyve  already  studied the past simple tense.Our mothers have  just  left  for  the station.The President has traveled to more than 20 countries  since  he was elected.Thomas hasnt had time to read the book  yet.Alice told me shes  already  been to that park.My daughters  just  finished her homework.Have they  already  spoken to Mr. Peters?Ive  just  interviewed the best candidate for the job.Our coach hasnt chosen the starting team  yet.Bob and Tim have  already  decided where they are going on vacation.Have you purchased a new computer  yet?Sam has wanted to go to Japan  since  he was a little child.Jason hasnt worked here  for  very long.Our boss has  just  hired a new engine er.