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Bài 3.

1. I haven't cutted my hair since last June.(sửa: cut)

2. She has not working as a teacher for almost 5 years. (sửa: worked)

3. The lesson haven't started yet. ( sửa: hasn't)

4. Has your cat eat yet?( sửa: ate)

5. I am worried that I haven't finished my homework yet.( sai từ hasn't)

6. I have just decided to start working since next week.( thiếu từ since)

7. He has been at his computer since seven hours.( sửa : for )

8. She hasn't recieved any good news since a long time( sửa : for)

9. My father hasn't play any sport for last year.( sửa: since)

10. I'd better have a shower. I hasn't had one since Thursday.( sửa: haven't)

Bài 5.

1. We studied a very hard lesson the day before yesterday.

2. We have studied almost every lesson in this book so far.

3. We watched that television program.

4. We watched an interesting program on television last night.

5. My wife and I traveled many times in the past.

6. My wife and I traveled to Mexicoby air last summer.

7.  I read the novel by Hemingway several times before.

8. I read that novel again during my last vacation.

9. I had a little trouble with my car last week.

10. However, I have had no trouble with my car since then.