Công thức thì HTĐ (V: tobe)

(+) S + am/is/are ..

(-) S + am/is/are + not .. 

(?) Am/Is/Are + S + ... ? 

I + am

S số ít, he, she, it + is

S số nhiều, you ,we, they + are

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 QKTD 

(+) S + was/were + Ving 

(-) S + was/were+ not + Ving 

(?) Was/Were +S +Ving? 

Công thức thì QKĐ (V: to be)

(+) S + was/were + ... 

(-) S + was/were + not ... 

(?) Was/Were + S ... ? 

S số ít, I, he, she, it + was

S số nhiều, you, we ,they + were

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. A

DHNB: often (HTD)

2. B

DHNB: right now (HTTD)

3. D

DHNB: at ten o'clock yesterday (QKTD)

4. C

DHNB: this morning (QKD)

5. B

DHNB: Look! (HTTD)

6. A

7. A

DHNB: always (HTD)

8. D

When + QKD, QKTD

9. C

DHNB: last Saturday morning (QKD)

10. C

11. B

12. C

DHNB: last Friday (QKD)

13. D

QKTD + when + QKD 

14. C

DHNB: last Christmas (QKD)

15. B

DHNB: at the moment (HTTD)

16. C

DHNB: yesterday (QKD)

17. A

DHNB: every morning (HTD)

18. C

DHNB: last night (QKD)

`color{orange}{~MiaMB~}`