A.Grammar
I.
1.should/ ought to
2.should/ ought to
3.ought to
4.had better
5.had better/ should/ ought to
II.
6.You should have been more careful.
7.You should/ ought to eat less junk food.
8.You should/ ought to have called me
9.You shouldn't have lied to your mother.
10.You should/ ought to have studied more.
III.
11.have to
12.must
13.has to
14.must
15.have to
16.must
17.must
18.have to
IV.
19.mustn't
20.needn't/ don't need
21.mustn't
22.didn't need to/ didn't have to
23.needn't/ don't need to/ don't have to
24.mustn't
