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listen, ivan singing in the room.

he doesn't see that i look at it, as he reads something with a great interest.

call him now. i think that he doesn't sleep yet.

look at the person who sits at a window. he/she is our lawyer.

1.can

2.could

3.will be able

4.can

5.can(сомневаюсь,не вижу перехода времени)

6.can

7.can

1) there isn't a bookshelf at the window.2) there aren't two girls in the room.3) there isn't an armchair by the table.4) there aren't two beds in the bedroom