Chuyển câu bị động ở thì quá khứ đơn : 1, Nobody swept this street last week.     => 2, they looked after the chidren caerfully.   => 3, Where did they buy that skirt ?     => 4, Mr.Obama had " Bún chả " at Huong Lien food stall .    => 5, They did not decorate the room yesterday.    =>

Để chuyển câu bị động ở thì quá khứ đơn, ta thường sử dụng cấu trúc "was/were + V3".

1, This street was not swept last week.
2, The children were looked after carefully by them.
3, Where was that skirt bought by them?
4, "Bún chả" was had by Mr. Obama at Huong Lien food stall.
5, The room was not decorated by them yesterday.

The room was not decorated yesterday by them.

Bún chả was had by Mr. Obama at Huong Lien food stall.

Where was that skirt bought by them?

The children were looked after carefully by them.