II. GIVE THE RIGHT FORM
1, haven't seen
2, have studied
3, haven't spoken
4, has been writing / hasn't finished
5, have gone
6, have been waiting / haven't come
7, have you known
8, have gone / have never been
9, have read
10, has worked

III. GIVE THE RIGHT FORM
1, gets
2, am doing / think / know
3, loses / is looking
4, works
5, have you learnt
6, belongs
7, do you think
8, washes
9, have done
10, hasn't been / has lived

IV. GIVE THE RIGHT FORM
1, watched
2, Did you see
3, have known
4, read
5, traveled
6, studied
7, Have you read
8, hasn't spoken
9, have studied
10, has taught / graduated

V. GIVE THE RIGHT FORM
1, burnt / was cooking
2, were crossing / shouted
3, was walking / saw
4, was / worked
5, were you doing
6, Were you watching / phoned
7, didn't go / was raining
8, rang / was taking
9, waited / was arriving
10, stopped / was sleeping
VI.
1, had already gone / came