28. He was accused of stealing the money by somebody 

29. A bridge will be built by people over my house

30. Many buildings were built by them to commemorate Uncle Ho's birthday

31. The rules of the games must be observed by them carefully

`28,` He was accused of stealing the money.

Accuse + O + of + V-ing: buộc tội/ tố cáo ai đã làm gì.

`29,` A bridge will be built over my house.

S + will + be + V-pp`2`.

`30,` Many builidings were built to commemorate Uncle Ho's birthday.

N + was/were + V-pp`2`.

`31,` The rules of the games must be obeyed carefully.

N + must/should + be + V-ed.

$#Kemi$