1-could
2-can
3-can can't
4-can
5-must
6-can't
7-can
8-must
9-could
10-can
11-had to
12- can't
13-can
14-couldn't
15-could
16-can, could
17-can, can
18-could
19-can
20-can
21-can't
22-should
23-shouldn't
24-should
25-can
26-shouldn't
27-must
28-could
29-can, can't
30-must, could