情态动词的推测性用法
1. Possibility (may/might/can/could)
a.在疑问句中表示可能,须用can而不用may.
b.在肯定陈述句中,用can表示可能与用may往往产生含义上的微妙差别:用表示可能往往指逻辑上的;用表事实上的。
Mr Reed is in poor health. He can be ill at any time.
Mr Reed looks pale. He may be ill.
c.用can表可能,较多地用于否定句和疑问句,could不受此限。
If you dont have a guide, you could lose your way.
It cant/couldnt be true.
Can/Could the news be true?
d.表过去的可能可用may/might+不定式完成体或不定完成进行体,也可用can/could+不定式完成体。
She may/might have been expressing her true feelings at that moment.
She cant/couldnt have missed the train.
e.用might/could+不定式完成体有时可以表本来可能发生但没有发生,或本来可能完成却没有完成的动作。
You might have killed yourself.
I could have reported you.
使用半倒装的几种情况
1 当句首状语为否定词或带有否定意义的词语时
Never have I found him in such a good mood.
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