Question

Write the correct form:
1) Listen! Someone (to knock) at the door.
2) Don't go into the classroom! The students (to write) a dictation there.
3) They (to discuss) it since five o'clock.
4) Where is Petrov ? -He (to work) in the library. -He (to work) long ? -Yes, he (to work) since morning.

Answer 1

Извиняюсь, не могу помочь в данном задании