I
1 -to open/opening
2-to play
3-be listening
4-to go / going ?
5- Walking
6-to buy
7-going
8-phoned
9-complaining
10-to find
II
1-must
2-can
3-can't
4-have to
5-can
6-musn't
7-must
8-must
9-musn't
10-have to
