Question

unit 3 review
test yourself on the grammar of the unit.
a circle the correct words to complete the sentences.

1. isabel was / has been interested in yoga since high school.
2. she finally took / has taken her first yoga class last week.
3. she has read / has been reading a book about yoga. shell probably finish it tomorrow.
4. she has felt much healthier since she started / has started the yoga class.
5. she went / has gone to three yoga classes this week, and its only tuesday.
6. isabels roommate has been doing yoga since / for eight months.
7. more and more students became / have become fans of yoga in the past several years.

b complete the sentences with the simple past, present perfect, or present perfect progressive form of the verbs in parentheses.
lisa ____________ on her stamp collection for five years, and she still enjoys it. last year, she __________ a very valuable stamp on an old letter in her attic. at first, she __________ it was valuable. she (find out) after she did some research on the internet. of course, she __________ really excited. since then, she __________ to garage sales and flea markets every weekend. unfortunately for lisa, she __________ another valuable stamp, but she ____________ a great time searching.
c find and correct five mistakes.
a: how long did you been doing adventure sports?
b: ive gotten interested five years ago, and i havent stopped since then.
a: youre lucky to live here in colorado. its a great place for adventure sports. did you live here long?
b: no, not long. ive moved here last year. i used to live in alaska.
a: i havent go there yet, but ive heard its great.
b: it is great. when you go, be sure to visit denali national park.
now check your answers on page 475.
go to myenglishlab to complete the review online. simple past, present perfect, and preser

Explanation:

• Question A:
• For sentence 1, “since high school” indicates a time period from the past until now, so the present perfect “has been” is correct.
• In sentence 2, “last week” is a definite past time, so “took” (simple past) is right.
• Sentence 3: “She’ll probably finish it tomorrow” implies she is still in the process of reading, so “has been reading” (present perfect progressive) is appropriate.
• Sentence 4: “since she started” (simple past for the action that started the state) is correct as “since” is followed by simple past when referring to an action that began a state.
• Sentence 5: “this week” and “it’s only Tuesday” show an action that started in the past and is continuing, so “has gone” (present perfect) is used.
• Sentence 6: “for eight months” (a period of time) takes “for” with present perfect, so “has been doing yoga for” is correct.
• Sentence 7: “in the past several years” is a time frame from the past to now, so “have become” (present perfect) is used.
• Question B:
• 1. “for five years” and “still enjoys” indicate an action that started in the past and is continuing, so “has been working” (present perfect progressive).
• 2. “Last year” (definite past time) takes “discovered” (simple past).
• 3. “At first” (past time) takes “didn’t know” (simple past negative).
• 4. After doing research (past action), “found out” (simple past) is correct.
• 5. “got” (simple past) as it’s a completed action in the past.
• 6. “Since then” (a point in the past until now) takes “has been going” (present perfect progressive).
• 7. “hasn’t found” (present perfect negative) as the action of not finding is relevant from then until now.
• 8. “has had” (present perfect) as the experience of having a great time is relevant from then until now.
• Question C:
• “How long did you been doing” → “How long have you been doing” (present perfect progressive for an action that started in the past and is still going on).
• “I’ve gotten interested five years ago” → “I got interested five years ago” (simple past for a past action with a definite time).
• “I’ve moved here last year” → “I moved here last year” (simple past for a past action with a definite time).
• “I haven’t go there yet” → “I haven’t gone there yet” (present perfect “have + past participle”).
• “It is great” → “It’s great” (contraction is more natural in spoken English, but “It is great” is also grammatically correct; if considering common usage in such dialogues, “It’s great” is preferred).

Answer:

• Question A:

1. has been
2. took
3. has been reading
4. started
5. has gone
6. for
7. have become

• Question B:

1. has been working
2. discovered
3. didn’t know
4. found out
5. got
6. has been going
7. hasn’t found
8. has had

• Question C:
• “How long did you been doing” → “How long have you been doing”
• “I’ve gotten interested five years ago” → “I got interested five years ago”
• “I’ve moved here last year” → “I moved here last year”
• “I haven’t go there yet” → “I haven’t gone there yet”
• “It is great” → “It’s great” (or keep “It is great” depending on formality preference, but “It’s great” is more common in dialogue)