3a
1 - b
2 - c
3 - d
4 - a
3b
a) have to
b) have to
c) present - have to/has to, past - had to, future - will have to
d) must
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3a
1 - b
2 - c
3 - d
4 - a
3b
a) have to
b) have to
c) present - have to/has to, past - had to, future - will have to
d) must