1. Ta căn cứ bằng từ are carrying (thì hiện tại tiếp diễn)

Dịch: Những đứa trẻ đang mang những chiếc ghế vào nhà. 

 Viết lại bằng từ the chairs, chủ ngữ chỉ vật và được tác động trực tiếp bởi lũ trẻ => Câu mang nghĩa bị động nên ta viết lại câu theo cấu trục bị động của thì hiện tại tiếp diễn

1. The children are carrying the chairs into the house.

=> The chairs are being carried into the house by the children.

2. They awarded him the Nobel Prize for medicine in 1946

=> He was awarded the Nobel Prize for medicine in 1946

3. We saw him leave the office at 6 o'clock this morning

=> He was seen to live the office at 6 o'clock this morning

4. Many houses là N số nhiều mà chị? 

3. The boy screamed while one of his teeth was being pulled out by the dentist

4. Many houses have been destroyed by the fire

 1. He must pay the bills before the fifth of the month.

=> The bills must be paid before the fifth of the month.

2. No one hasn't opened that box for the past hundred years.

=> That box has been opened for the past hundred years.

3. The boy screamed while the dentist was pulling out one of his teeth.

=> The boy screamed while one of his teeth was being pulled out by the dentist.

4. The fire has destroyed many houses.

=> Many houses have been destroyed by the fire.