1．Four hundred dollars for a pair of shoes.You must be joking!

2．I may/might finish reading the book tomorrow，but I am not sure about it.

3．There are no classes today.Shall we go skating now?

4．I am so weak that I can't carry the heavy bag.

5．The door won't open.There must be something wrong with it.

Ⅱ.完成句子

1．他们一定没在图书馆里读书。

They can't be reading in the library.

2．--我可以在公园里摘花吗？

--不，不行。

-May I pick flowers in this park?

-No，you can't/mustn't.

3．房前禁止停车。

Cars mustn't be parked in front of the house.

4．我感到遗憾她竟会如此粗心。

I am sorry that she should be so careless.

5．他在北京时，常来看我。

He would come to see me when he was in Beijing.

Ⅰ.用适当的情态动词填空

1．I may come to the party with you，but I am not sure.

2．When he was young，he would climb the small hill every morning.

3．It is strange that such a gentleman should be so rude to a lady.

4．Tom comes from Australia；he can speak English very well.

5．I heard you bought a new book.May I have a look?

6．You've been working all day.You must be very tired.

7．(The doorbell rings) I wonder who that is.It can't be Lisa.She's still in the library at this time.

8．It is a long time since we met last time.You should come and see me more often.