Trả lời:

1, The floor was cleaned by my mother yesterday.

2, Some food was being bought at 11 am by my sister yesterday.

3, Their work had been finished before you came yesterday (by them)

4, Trees were being planted in the garden at 4 pm yesterday (by him)

5, A picture was being painted by her while her mother was making a cake

hoặc She was painting a picture while a cake was being made by her mother

hoặc A picture was being painted by her while a cake was being made by her mother

6, A letter was being typed by him when his boss went into the room

7, This pen had been bought before I went to bed last night.

Giải thích thêm:

- Câu 1: thì QKĐ

 Câu 2, 4, 5, 6: thì QKTD

 Câu 3, 7: thì QKHT

- Cấu trúc câu bị động:

Active: S + V + O

→ Passive: S(O) + tobe + P2 + (by O(S))

  ~잘 공부하세요~

@su

$\text{#BTS}$

1. The floor was cleaned by my mother yesterday

2. Some food was being bought at 11 am yesterday by my sister 

3.  Their work had been finished before you came yesterday.

4. Trees were being plented at 4pm yesterday by my brother

5. A picture was being painted by her while a cake was being made by her mother.

6. A letter was being typed by him when his boss went into the room.

7. This pen had been bought before i went to bed last night.

CHÚC BẠN HỌC TỐT

#NOCOPY