四六级常考语法精讲虚拟语气.ppt
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1、四六级常考语法之虚拟语气,1. 表示现在/过去/将来情况的虚拟条件句,虚拟条件句主要有三种结构: 1) 表示与现在情况相反:主句谓语用“would / could / might +动词原形”,从句谓语用“动词的一般过去时”(动词be的过去式一律用were)。 If I were you, I would not accept his offer. If I had time, I would certainly go to the cinema with you. 2) 表示与过去情况相反:主句谓语用“would / could / might + have +过去分词”,从句谓语用过去完成
2、时。 If I had got up a little earlier, I wouldnt have missed the train. If I had been more careful, I might have passed that exam. 3) 表示与将来情况相反:主句谓语用“would / could / might +动词原形”,从句谓语用“were +动词不定式”或“should +动词原形”。 If I were to do the job, I would not be able to have enough time to study. If it should
3、rain tomorrow, I would not go out with you.,2. 虚拟条件句连接词if的省略,如果虚拟条件句的从句中含有were, had, should, could等词时,可以省略连接词if,但这时必须把were, had, should, could等词移到主语前面,形成倒装。这种句型主要用于书面形式。 Were I to do the job, I would finish doing it within two weeks. Had it not been for his help, we couldnt have arrived there on tim
4、e. Should it rain tomorrow, I would stay at home.,3. wish后宾语从句中的谓语构成,动词wish后的宾语从句表示未实现的或不可能实现的愿望,其宾语从句中的谓语动词要用虚拟语气,有以下三种构成形式。 1) 表示现在不可能实现的愿望,宾语从句中的谓语动词用一般过去时。(be的过去式为were)。 I wish I had enough money to buy a car. I wish I were as young and energetic as you. 2) 表示过去未能实现的愿望,宾语从句中的谓语动词用过去完成时(had +过去分词
5、)或“would / could + have +过去分词 ”。 I wish I hadnt made such a mistake. I wish I could have done it better. 3) 表示将来不可能实现的愿望,宾语从句中的谓语动词用“would / should (could, might) +动词原形”。 I wish I would not get old. I wish I could travel around the world one day.,4. 某些动词后的宾语从句中谓语动词要用虚拟语气,在一些动词后面的宾语从句中,谓语动词要用虚拟语气。这时,
6、谓语动词用动词原形或should +动词原形。这类动词一般表示命令,要求,决定,建议,主张等概念,主要有:advise, ask, command, decide, demand, desire, direct, insist, move, order, propose, recommend, request, require, suggest,等。 The workers demanded that their wages (should) be raised by 10 per cent. The teacher decided that you do the experiment fir
7、st.,5. 某些名词后的表语从句和同位语从句中谓语动词要用虚拟语气,在一些名词后面的表语从句和同位语从句中,谓语动词要用虚拟语气。这时,谓语动词用动词原形或should +动词原形。这类名词一般表示命令,要求,决定,建议,主张等概念,主要有:advice, idea, instruction, motion, order, plan, proposal, recommendation, request, requirement, suggestion,等。 My suggestion is that we (should) send for a doctor immediately. He
8、gave the order that they (should) do the experiment again.,6. 错综时间条件句,条件从句表示的动作和主句表示的动作,有时发生的时间是不一致的.如从句是对过去情况的假设,而主句可能是对现在正在进行情况的假设。 这种句子称为错综时间条件句. If the weather had been more favorable, the crops would be growing still better.,7. 某些主语从句中的谓语动词要用虚拟语气,某些表示命令,要求,决定,建议,主张以及“重要性”和“紧迫性”等概念的主语从句中谓语动词要用虚拟
9、语气。这时,谓语动词用动词原形或should +动词原形。这类主语从句一般由 “It is (was) + 形容词过去分词 + that引导的从句”构成。该结构中,常用的形容词主要有:advisable, appropriate, desirable, essential, imperative, important, necessary, obligatory, proper, urgent, vital等;常用的过去分词主要有:arranged, decided, demanded, desired, ordered, proposed, recommended, requested, s
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