Mong mọi người giúp đỡ

`+` Bị động modal verbs : S + modal verbs + be + V3/ed + (by O) 

1. Some new airports can't be constructed on islands.

2. This promise might be fulfilled by the new president as quickly as people would like. 

3. Videos like this one can be bought anywhere.

4. The hotel should be finished by the time you arrive. 

5. The accident ought to have been reported to the police.

`-` Câu chủ động : S + ought + to + have V3/ed : Ai lẽ ra nên làm gì

`=>` Câu bị động : S + ought + to + have + been + V3/ed + (by O) : Cái gì/Ai lẽ ra nên bị/được làm gì