Составьте предложение из слов
Them / of / what / knew / do / to / none.

None of them don't know what to do.

i never have to go the library. or:

i don't have to go library frequently.

.1.-open the window.

-but i have opened the window.

2.i have seen the film.

3.he has opened the door.

4.they have cleaned the room.