1)Some old buildings at the city center have been knocked down to make room for a new shopping mall. Công thức bị động của thì htht 2)In the past,students didn’t use to have computers for projectors or technological devices in the classrooms. Cấu trúc với used to V 3) City people hardly talk or visit their neighbors because they have to work from dawn to dusk. 4)It is suggested that traditional crafts preserve our promote. It +be+suggested that S+V 5)Before taking the entrance examination, he used to suffer from sleep difficulties. Cấu trúc với suffer from st and before+V-ing

`1` Some old buildings in the city center have been knocked down recently to make room for a new shopping mall 

`=>` Bị động thì hiện tại hoàn thành : S + has / have + been + Vpp + ( by + O )

`2` In the past, students didn’t use to have computers for projectors or technological devices in the classrooms.

`=>` In the past `-` thì quá khứ đơn : S + didn't + V + O 

`-` Didn't use to + V : chưa từng có 

`3` City people hardly talk or visit their neighbors because they have to work from dawn to dusk.

`=>` Hardly `-` thì hiện tại đơn : S + V ( s - es ) + O 

`=>` Because : bởi vì `-` dùng để nối `2` mệnh đề nguyên nhân kết quả

`4` It was suggested that traditional crafts should be preserved and promoted.

`=>` Bị động không ngôi + suggest : It + be suggested + that + S + should + V + O

`5` Before taking the entrance examination, he used to suffer from sleep difficulties.

`=>` Before + Ving : Trước khi làm việc gì đó 

`=>` Used to - V : đã từng làm việc gì