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,....

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 QKĐ (V: thường) 

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...

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

1. to buy 

need + to V: cần 

2. has taught 

DHNB: since 1995 (HTHT)

3. will be prepared 

DHNB: tomorrow (TLD)

S + will be + V3/ed: bị động 

4. brings 

DHNB: every day (HTD)

5. will be published 

DHNB: next month (TLD)

S + will be + V3/ed: bị động 

6. is spoken 

S + am/is/are + V3/ed: bị động - HTĐ

7. has just fixed

DHNB: just (HTHT)

8. playing 

enjoy + Ving: thích 

9. have lost 

10. saw

DHNB: this morning (QKD)

11. bought 

DHNB: yesterday (QKD)

12. has had

13. arrived / had / went 

DHNB: last night (QKD)

14. has taken 

15. did / start

16. didn't eat / didn't feel 

DHNB: yesterday (QKD)

17. Have / washed 

18. didn't  /want 

DHNB: last Sunday (QKD)

19. have never met 

DHNB: never (HTHT)

20. Does / rise / is rising 

DHNB: always (HTD)

`color{orange}{~MiaMB~}`