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Exercise 3: Mỗi câu sau chứa một lỗi sai. Tìm và sửa chúng.
1. I haven't cutted my hair since last June.
2. She has not working as a teacher for almost 5 years.
3. The lesson haven't started yet.
4. Has the cat eat yet?
5. I am worried that I hasn't still finished my homework yet.
6. I have just decidedto start working next week.
7. He has been at his computer since seven hours.
8. She hasn't receivedany good news since a long time.
9.My father hasn't playedany sport for last year.
10. I'd better have a shower. I hasn't hadone since Thursday.