透明宝宝
幼苗
共回答了12个问题采纳率:91.7% 举报
答案A,can
1 must表示推测的用法
must表示推测时,只用于肯定句,表示很大的可能性,意为“一定,准是,必然会”.其否定形式是 can’t/couldn’t
(不可能).例如:
You haven’t eaten anything since this morning; you must be
hungry.
That can’t be Mary — she’s in hospital.
2 can/could表示推测的用法
① can表示推测时,多用于肯定句和疑问句.当用于肯定句时,指“有时可能会”,是理论上的可能,其时间意义宽泛不具体.例如:
Even
experienced teachers can make mistakes.
② could表示推测时,既可以用于肯定句,又可以用于疑问句. 例如:
My book has disappeared. Who could
have taken it?
③ can’t/couldn’t表示推测时,用于否定句,是语气最强的否定推测,意为“不可能,一定不(是)”. 例如:
He
can’t/couldn’t have seen her there.
④ can/could在疑问句中表示推测时,含有怀疑或疑问的意味,could比can更不确定.例如:
Can the news be
true?
Who can it be?
3 may / might表示推测的用法
① may / might表示推测时,用于肯定句,表示无把握的推测,意为“可能,或许”. (might 比may
更加不肯定,更无把握).例如:
He may/might be writing a letter now.
They may have been
discussing the problem this morning.
② may not/ might not表示推测时,用于否定句,表示(无把握的)否定推测,意为“可能/或许不”. 例如:
He looks
very happy. He might not have known the result.
4 should表示推测的用法
should表示推测时,表示按常规、常理的推测,即“(正常情况下)按理应该”,暗含很大的可能性,但语气比must弱.例如:
It’s nearly
seven o’clock. Jack should be here at any moment.
Three weeks should be
enough.
1年前
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