初中英语-情态动词表示推测的用法及专项练习.docx'情态动词 must, can, could, may, might 表推测的用法: 1 .用于肯定的推测:must > can > could > may > might 1) 其中must语气最强最肯定,只用于肯定句,意为 “一完成时,表示对现在发生的动作或过去发生的动作进行 推测。 They can't be reading in the 。 He can't have gone to Shanghai for I saw him a minute ago. 他不可能去了上海,我刚才还看见他。 It's so late. Where can she have gone?天晚了,她可能去哪儿了呢? 在反意疑问句中,当陈述部分含有表示推测意义的can't时,疑问部分的助动词 应与can't后面的动词在非推测情况下的用法保持一致. He can't be a teacher, is he?他不是教师,是吗? She can't have finished her homework, has she? 她一定没有完成家庭作业,是不是? could可用于表示某事有可能发生或可能是事实。 Don't eat it. It could be ,可能有毒。 The plane could be delayed by 。 could还可以用于表示客气、委婉、礼貌的请求语气。 Excuse me, could you tell me the way to the bus station? Could you help me? couldn't表示否定推测,表示某事不可能真实,或由于特定事实或环境某事肯定 不会发生。 It couldn't possibly be 。 注:有时与形容词的比较级连用强调某人或某物不可能再更多地具有某种属性。 You couldn't be more 。 I couldn't be 。 may和might的用法 may, might表示推测“可能性”时,意思是“可能”、“也许”,语气没有must R aEo He may / might be American. = It is possible that he is American. 他可能是个美国人。 注:might不表示过去时态,只是语气上比may更委婉,表示的可能性更小。 may, might表推测时,可以用于否定句,意思是"可能不、也许不”,但不用 于疑问句。 He may / might not be at home,他也许不在家□ may, might可以推测现在正在发生的动作或过去发生的动作。 He may / might be sleeping now.(现在)他可能正在睡觉。 The boy may / might not be watching TV at home. (现在) 这个男孩可能没在家看电视 These students may / might have seen the film before.(过去)