=>

1. bought

-> 2 months ago (QKĐ, S V2/ed)

2. washed

-> three years ago (QKĐ)

3. was

-> last night (QKĐ)

4. didn't go

-> yesterday morning (QKĐ, S didn't V)

5. were cooking

-> QKTD when QKĐ

6. have enjoyed

-> for the last ten years (HTHT, S have/has V3/ed)

7. did

-> last night (QKĐ)

$\text{1. Bought }$

- Thì QKĐ : S + Ved/Vp2

- Dấu hiệu : ago

$\text{2. washes}$

- Thì HTĐ : S + Ves/s

- Dấu hiệu : usually

$\text{3. was }$

- Thì QKĐ dạng tobe : S + was/were + O

- Dấu hiệu : last night

$\text{4. didn't go }$

- Thì QKĐ dạng phủ định : S + didn't + V-bare

- Dấu hiệu : yesterday

$\text{5. were cooking}$

- Thì QKTD : S + was/were + Ving

- QKTD when QKĐ

$\text{6. have enjoyed }$

- Thì HTHT : S + have/has + Vpp

- Dấu hiệu : for

$\text{7. did}$

- Thì QKĐ : S + Ved/Vp2

- Dấu hiệu : last night

$#Thương$