Công thức thì HTĐ (V: thường)

S số ít, he, she, it 

(+) S + Vs/es

(-) S+ doesn't + V1 

(?) Does +S +V1?

S số nhiều, I, you, we, they

(+) S + V1 

(-) S+ don't + V1 

(?) Do + S+ V1? 

DHNB: always, usually, sometimes, often, never, seldom,....

Công thức thì HTTD 

(+) S + am/is/are + Ving 

(-) S + am/is/are + not + Ving 

(?) Am/Is/Are +S +Ving? 

DHNB: now, right now, (!), at present, at the moment,.....

Công thức thì HTHT

(+) S + has/have + V3/ed 

(-) S + has/have + not + V3/ed 

(?) Has/Have + S+ V3/ed?

DHNB: before, since + mốc thời gian, for + khoảng thời gian, yet, already, just,....

-------------------------------------

1. works 

DHNB: every day (HTD)

2. Does he always tell

DHNB: always (HTD)

3. helps 

DHNB: never (HTD)

4. swim

DHNB: twice a week (HTD)

5. takes 

6. leaves 

DHNB: rarely (HTD)

7. don't live 

8. travels 

DHNB: every Sunday (HTD)

9. bake 

DHNB: twice a month (HTD)

10. are cooking 

11. is traveling 

DHNB: this summer (HTTD)

12. is lying 

DHNB: now (HTTD)

13. are playing

DHNB: nowadays (HTTD)

14. Does he always tell 

DHNB: always (HTD)

15. Have you ever been 

DHNB: ever (HTHT)

16. have lived 

DHNB: for six months (HTHT)

17. dance 

DHNB: usually (HTD)

18. is reading 

19. aren't drinking 

DHNB: now (HTTD)

20. play 

DHNB: once a week (HTD)

21. is having 

DHNB: right now (HTTD)

22. is traveling 

DHNB: this summer (HTTD)

23. has been raining 

24. is cooking

25. goes 

DHNB: every weekend (HTD)

26. Have you ever eaten 

DHNB: ever (HTHT)

27. hasn't come 

DHNB: for a long time (HTHT)

28. have worked 

DHNB: for three years (HTHT)

29. Have you ever been 

DHNB: ever (HTHT)

30. hasn't played 

DHNB: since last year (HTHT)

31. has been playing

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