Shall I...?
2 You needn't..
3 We must
4 You should
5 He could
6 It might
7 We could go
8 You mustn't
9 May I...?
10 He didn't have to

a I advise you to
b We are obliged to
c Let's go
d He was able to
e Would you like me to?
f It isn't necessary for you to
g You are forbidden to
h it wasn't necessary for him to
i it is possible
j is it OK if i?