Giúp to vói ạaa cam on nhóo

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: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

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

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

1. A 

DHNB: at 9 o'clock yesterday morning (QKTD)

2. D

if 2: If + QKD, S + would / could + V1 

3. C

DHNB: Look! (HTTD)

4. D

if 2: If + QKD, S + would / could + V1 

5. D

When + QKD, QKTD

6. A

HTHT + since + QKD

7. B

QKD + while + QKTD

8. C

S số ít+ has + N 

9. D

DHNB: at this time yesterday (QKTD)

10. C 

QKTD + when + QKĐ

11. A

If 1: If + HTĐ, S + will/can/shall .. + V1 

12. D

DHNB: at present (HTTD)

13. A 

DHNB: last week (QKD)

14. D

While + QKTD, QKTD

15. A

if 2: If + QKD, S + would / could + V1 

`color{orange}{~MiaMB~}`