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专题五 情态动词和虚拟语气 一、表能力 (1) I’m starving. I __________ eat 2 bowls of rice now. (2) If you have a good sleep, you ____________ work out this problem tomorrow. (将来的能力) (3) The fire spread very quickly but everyone ______________ get out. (过去有具体的能力;成功的做了某事) can will be able to was able to 二、表推测 (可能性) 1. 表客观的、理论上的可能性 (肯定句) (1) Accidents can happen on such rainy days. (2) He is a nice person in general, but he can be rather difficult. Compare: We may go to the cinema tonight, but we are not sure yet. 实际可能性不用can 二、表推测 (可能性) 2. 表具体事情发生的可能性 must (肯定句) should/ought to (不用于问句) can (否定句疑问句) could may (不用于问句) might(不用于问句) (1) My dry cleaning should be ready this afternoon. (2) Can this be done by him? (3) He must have left town. I haven’t seen him for a while. 肯定句 否定句 疑问句 can /could can must 三、表示请求、允许、允诺 (1) Shall/May/Might/Can/Could I/we…? Shall I pick the children up from school today? (2) Shall he/she/they…? When shall my father be able to leave hospital? (3) Would/will you…? Would you do me a favor? (4) Could/Might/would/should…? (To show politeness) Could I use your bike tomorrow morning? Yes, you can. (5) shall 与第二、三人称用于陈述句,表示说话者的命令、警告或威胁; 当宣布法律规定时,也用shall --You shall leave the room at once, and he also shall! ---It has been announced that candidates shall remain in their seats until all the papers have been collected. 四、表必要性 1. must/have to mustn’t/don’t have to 3. need to do /need do don’t need to do /needn’t do Compare: needn’t have done VS didn’t have to do/didn’t need to do You needn’t have worked (work) that late last night. It was harmful to your health. -Did you work very late last night? - No, I didn’t . I didn’t need to work (work) very late. 4. should/ought to do (have done) 五、宁愿做 1. would rather do 2. would rather do sth than do sth 3. would do sth rather than do sth 4. would rather sb. did sth 1. prefer to do 2. prefer to do rather than do 3. prefer doing to doing 六、情态动词/had better/would rather/would like to +have done P57 1.must have done 2.can/c
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