1) could
2) don't have to
3) can ; can't
4) can
5) must
6) mustn't
7) can
8) will
9) will
10) have to
11) would
12) had to ; don't have to
13) shall
14) can't
15) had to
16) have to ; will
17) mustn't ; have to
18) couldn't
19) don't have to
20) can
21) don't need to
22) have to
23) mustn't
24) has to
25) can
26) can't
27) have to
28) could
29) can ; can't
30) can sau have to (fraza e incompleta)
