而can表示的是逻辑上的可能性:
Mary is in poor health. She can be ill at any times.
在否定句中只能用can和may。所以can’t时用以代替mustn’t,语气比may更肯定。中文可以翻译为不可能。 Michael______be a policeman, for he’s much too short.
A.needn’t
B.can’t
C.should
D.may
在疑问句只能用can,不能用may和must。 He may be very busy now.
Can he be very busy now?
He must be very busy now.
Can he be very busy now?
need need作为情态动词只有一种形式,只用于否定句和疑问句。
dare dare作为情态动词用时有两种形式:dare和dared两个词形,除了可以用于否定句和疑问句外,还可以用于条件从句或表示怀疑的句子中。 If he dare come,I will kick him out.
I don’t know whether he
dare say.
注意:He doesn’t dare(to)answer the question.(否定句)
Does she dare(to)enter the dark room?(疑问句)
shall 用于第一人称:征求对方的意见。 What shall we do this evening?
用于第二、三人称:警告、命令、允诺、威胁等。 You shall fail if you don’t work harder. 警告
He shall have the book when I finish reading.允诺
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