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d. can和be able to的用法比较
can用来表达能力时，由于只有现在时和过去时两种形式，其他时态要用be able to来表达。如：
I can play the piano.
He has not been able to finish the work in time.
③ must 的用法
a. must表示必须，应该。如：
Must I come to the party?
The article must be completed before Friday.
b. must的否定形式mustn’t, 表示“不应该、不可以、禁止”。如：
You mustn’t get to school too late.
Must I do it now? Yes, you must. No, you needn’t
She must have gone to Beijing.
You must say sorry to me for that.
You mustn’t clean only your own room.
④ need的用法
a. need作为情态动词主要用于否定句和疑问句，较少用于肯定句。如：
I needn’t wear a coat. = I don’t think I need wear a coat.
I don’t need things like that.
⑤ shall
用于第二、第三人称，表示说话人的意愿。如:
He shall get his money.
You shall do exactly as you wish.
Shall I turn on the light?
Shall I open the window?
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