Răspuns:
ex.4
1- has gone
2- have been
3- has gone
4- has been
5- have gone
ex.5
1- for
2-never
3-yet
4-ever
5- just
ex.6
1-haven't finished
2-has been waiting
3-has never did
4-have you ever tried
5-have been playing
ex.7
1- mustn't
2-must
3-could
4-may
5-might
