`2` These postcards are sent to us by our friends 

Hoặc : We are sent (to) these postcard by our friends 

`=>` Câu bị động thì Hiện Tại Đơn : S + is/am/are + Ved/V3 + ( by O ) 

`=>` These postcard là số nhiều `->` chia are 

`=>` We là số nhiều `->` chia are

`3` They were told this story by their grandmother when they visited her last week 

Hoặc : This story was told to them by their grandmother when they víisted her last week 

`=>` Câu bị động thì Quá Khứ Đơn : S + was/were + Ved/V3 + ( by O ) 

`=>` They là số nhiều `->` chia were

`=>` This story là số ít `->` chia was