Ex12:
1, shouldn't
2, mustn't
3, don’t have to
4, might
5, should
6, Must
Ex13
1, It may rain.
2, Jack might go to bed.
3, I may not in class on time.
4, Sarah might buy some clothes.
5, They may see each other.
6, James might get sick.
7, My brother may eat some food.
8, I might not go to work today.
9, Susan may know the address.
10, Joanna mightn't have received my message.