11. we started learning English 4 years ago. (thì quá khứ đơn)

12. my father has given up smoking for a year.(thì hiện tại hoàn thành)

13. we have learned English for 4 years.(thì hiện tại hoàn thành)

14. Ba is the tallest in my class. (so sánh hơn sang so sánh nhất)

15. Trung was given a computer by his parents on his birthday. (bị động)

16. Peter told me that nam was working in Ho Chi Minh city then (tường thuật)

17. I wish I could English perfectly. 

18. don't forget to turn off the light before going out 

19. what an intelligent girl! 

20. because Lan was careless, she broke the glass