$\text{11.}$ 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.