表推测时,英语中只使用must,may,might,may not和can't。这五个表达的语气依次递减: must:一定(语气肯定) may:也许(不很肯定) might:或许(比may语气更弱) may not:也许不(表否定) can't:一定不(must的反义) 推测现在的事情用must,may,might,may not和can't+do或be e.g.She must be at home now. The boy may play now. 推测过去的事情用must,may,might,may not和can't+have done e.g.She might have been ill yesterday. He must have hold the party. 注意:表推测的must,may,might,may not和can't是不可以与I think...连用。因为I think...已有推测的含义,故不能连用
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