Ex IV.
1, must
2. mustn't
3, haven't to
4. have to
5, Must you
6, must
7, has to
8, have to
9, Must you
10, haven't to
11, have to
12, have to
13, must
14, have to
15, mustn't
Ex V.
1.c
2.d
3, a
4. e
5, f
6. b
7. g
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