Chúc bạn học tốt nhé

5. The students clean this room everyday.

$\longrightarrow$ This room is cleaned by the students everyday.

6. The workers have just built a new bridge here

$\longrightarrow$ A new bridge has been built by the workers.

7. I bought that schoolbag last year.

$\longrightarrow$ That schoolbag was bought last year by me.

8. Ba has finished these works before lunch.

$\longrightarrow$ These works has been finished before lunch by Ba

9. We will do an English test next week.

$\longrightarrow$ An English test will be done next week by us.

10. He is going to give his son a present.

$\longrightarrow$ The son is going to be given a present by his father

11. We must do the exercises carefully.

$\longrightarrow$ The exercise must be done carefully by us.