4. This dish is brought to me by the waiter. 

5. These rooms are kept tidy all the time (by they). 

6. These postcards are sent to us by our friends. 

*Công thức câu bị động thì hiện tại đơn: 

+ Câu chủ động: S + V + O 

→ Câu bị động: S + tobe + V3 ( + by someone ) 

1. The waiter brings me this dish.

-> This dish is brought to me (by the waiter).

2. They keep this room tidy all the time.

->this room is kept tidy all the time

.3 Our friends send these postcards to us.

-> These postcards are sent to us(by our friend).