4- Why …does.. Tom ( buy ) .........buying.................. that book last Tuesday?

5. I (remember).....remember................... your trip to Nha Trang two years ago.

6. Ba ( not wear)........doesn't waer..................... the cap all day everyday.

7. I ( not eat)............don't eat.............. a lot of fish yesterday.

8. Her aunt (take)............takes....................... her to see Cham Temple for 2 years .

9. …Does……..Tuan (have)............have.................. a new bike yesterday?

10. She (not buy)......doesn't buys............................ a new ruler yesterday.

11. He (not talk)........don't talk.................... with his parents  now

12. They (not come).......don't come........................... school next day

13. The windows (not close).....don't close....................... since 2005

14. We (not stay)............don't stay.......................... at home at 7 pm last Monday.

15. She (not drink).............doesn't drink................................ milk  yesterday.

16……How does…... Lan ( go)...............go to..............Ho Chi Minh city two years ago?

4. did...buy

5. remember

6. doesn't wear

7. didn't eat

8. has taken

9. Did...have

10. didn't buy

11. isn't talking

12. will come

13. haven't been closed

14. weren't staying

15. didn't drink

16. Did...go