I. Correct verbs form/tense:

1. were

-> "ago" => Thì QKĐ

2. have visited

-> "the first time" => Thì HTHT

3. has improved / left

-> Trước "since" ta dùng thì HTHT còn sau "since" ta dùng thì QKĐ

5. bought/ haven't worn 

-> "last week" => Thì QKĐ

"yet" => Thì HTHT

6. haven't seen / left

-> Trước "since" ta dùng thì HTHT còn sau "since" ta dùng thì QKĐ

II. Change into passive:

CÁCH LÀM: Sử dụng công thức chuyển đổi câu bị động thì QKĐ:

- Chủ động: S + V_ed + O

`->` Bị động: S + was/were + V_pII + O.

LỜI GIẢI CHI TIẾT:

1. The letter was read many times last night.

2. Tim was met at the market yesterday.

3. I wasn't introduced to her mother.

4. This tree was planted.

5. He was helped do his homework.

6. I wasn't invited to the birthday party.

7. That house was built in 1972.

#Chii

#Tired of studying well