Поставьте сказуемое в соответствующую временную форму: these books (return) to the library yesterday. the books must (return) to the library till the end of this month. why your home ask (not do)? the patient was taken to the hospital today, and (operate) tomorrow morning. this room (use) only on special occasions. litter must not (leave) here.
the books must be returned to the library till the end of this month.
why didn't your home ask?
the patient was taken to the hospital today, and will be operated on tomorrow morning.
this room is used only on special occasions.
litter must not be left here.