$\text{11.}$ Some books have been left on the table by me but I can't find them now.

$\text{→}$ S + have/ has been + Ved/ P2 + (by).

$\text{12.}$ Many trees will be planted around our school to get some more shade by us.

$\text{→}$ S + will be + Ved/ P2 + (by).

$\text{13.}$ A lot of information can be stored in a small USB stick.

$\text{→}$ S + can be + Ved/ P2 + (by).

$\text{14.}$ He may be punished for talking in the class by the teacher.

$\text{→}$ S + may be + Ved/ P2 + (by).

$\text{15.}$ This machine couldn't be used with detailed instructions.

$\text{→}$ Nếu có no one thì chuyển sang bị động ở dạng phủ định.

11. Some books have been left on the table by me but I can't find them now.

12. Many trees will be planted around our school to get some more shade by us.

13. A lot of information can be stored in a small USB stick.

14. He may be punished for talking in the class by the teacher.

15. This machine couldn't be used with detailed instructions.

Giải thích: 

Cấu trúc dùng trong bài:

- S + have/has + been + Ved/V2

- S + will / may / can + be + Ved/V3

- Riêng câu 15 do S là No one nên bị động sẽ bỏ no one đi và thành phủ định

`text{~ Học Tốt Nha ~}`