Сделайте задания под знаками А,В,C. Только обозначьте где какая буковка.

Have to, Must +
Don't have to, Mustn't -
A.
1+
2-
3+
4+
5+
6+
7+
8-
9+
B.
1+
2+
3+
4+
5?
6-
7+
C.
1 must
2 must
3 mustn't
4 doesn't have to
5 have to
6 must
7 don't have to
8 mustn't
9 must
10 ?
11 must
12 must
13 have to
14 must
15 doesn't have to
Полагаюсь, все верно, но Вы проверьте.