②表示过去习惯性动作或某种倾向。 We would play badminton on Sundays. 6.shall和should的用法 (1)shall 用于第一、三人称,在问句中表示征求对方意见或请求。 Shall I come in? 用于第二、三人称的陈述句中,表示命令或威胁。 You shall do as your father says. (2)should ①表示责任、义务,意为“应该”。 ②表示惊讶语气,意为“竟然”。 You should wear slippers in class. ③用于条件句,表示“假如,万一”,省去if,should可提至句首。 Should you be late,apologize to the teacher. 7.情态动词表示推测或判断的用法 下表即是表示推测的情态动词使用的场合: 情态动词 对现在和未 来的推测 对过去 的推测 使用场合 must must+do must have done 肯定句 may/might may/might+do may/might have done 肯定句、否定句 can/could can/could do can/could have done 否定句、疑问句(could可用于肯定句) should 用来表示一种估计的情况“按理会/估计会”should do should have done 肯定句、否定句、疑问句 情态动词+have done的用法 (1)should have done表示“本来应该做某事而实际上未做”,而shouldn’t have done则表示“本不应该做某事而实际上做了”。 You should have told me about it earlier. You shouldn’t have said such words to your parents. (2)ought to have done也表示“本应该……”,而ought not to have done则意为“本不应该……”。 You ought to have told me about it earlier. You ought not to have said such words to your parents. (3)needn’t have done表示“本无必要做某事而实际上做了”。 You needn’t have walked so quickly since time was enough. (4)could have done表示“本来有可能……而事实上未做到”。 I could have come on time,but my car broke down on the way. (5)may/might have done表示“过去可能发生过某事”或“本来应该或可以做某事(实际上没做)”。 You might have given him more help,but you were so busy. ◆虚拟语气的核心考点 1.虚拟语气用于条件状语从句 (1)表示与现在事实相反的假设,条件状语从句中的谓语动词用一般过去时(be动词用were),而主句中的谓语动词用“would/should/could/might+动词原形”。 If I were you,I would buy that house. If he had time,he should go with you. (2)表示与过去的事实相反,条件状语从句中的谓语动词用过去完成时,主句中的谓语动词则用“would/should/might/could+have+过去分词”。 If he had taken my advice,he would have succeeded in passing the examination. (3)表示与将来事实相反,条件状语从句中的谓语动词用一般过去时或“should/were to+动词原形”,而主句中的谓语动词则用“would/should/could/might+动词原形”。 If it were to rain tomorrow,the football match would be put off. (4)当条件状语从句表示的行为和主句表示的行为所发生的时间不一致时,动词的形式要根据它所表示的时间作相应调整。 If they had worked hard,they would be very tired now.(从句说的是过去,主句指的是现在) 2.虚拟语气用于名词性从句 (1)虚拟语气在宾语从句中的运用。 ①“wish+宾语从句”表示不能实现的愿望,译为“要是……就好了”等。表示现在不能实现的愿望,从句中的谓语动词用一般过去时;表示将来不能实现的愿望,从句中的谓语动词用“would/could+动词原形”;表示过去不能实现的愿望,从句中的谓语动词用“had+过去分词”或“could/should+have+过去分词”。 I wish it were spring all the year round. I wish I had known the answer. I wish I could fly like a bird. ②在表示建议、要求、命令等动词后的宾语从句中,谓语动词用“should+动词原形”,should可以省略。 常见的动词有:suggest,advise,propose,demand,require,insist,request,command,order等。 She suggested we (should) leave here at once. The doctor ordered she should be operated on. (2)虚拟语气在同位语从句和表语从句中的运用。 表示建议、要求、命令等的名词,如advice,idea,order,demand,plan,proposal,suggestion,request等,其后的表语从句和同位语从句中谓语动词用“(should+)动词原形”,should可以省略。 His suggestion that we (should) go to Shanghai is wonderful. My idea is that they (should) pay 100 dollars. (3)虚拟语气在主语从句中的运用。 在主语从句中,谓语动词的虚拟语气用“(should+)动词原形”的结构,表示惊奇、不相信、理应如此等。 It is necessary (important,natural,strange,etc.)that we (should) clean the room every day. It was a pity (a shame,no wonder,etc.)that you (should) be so careless. It will be desired (suggested,decided,ordered,requested,proposed,etc.)that she (should) finish her homework this afternoon.
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