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1、1. 表示现在表示现在/过去过去/将来情况的虚拟条件句将来情况的虚拟条件句v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时。
2、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 rain to
3、morrow, I would not go out with you.8. as if / though引起的从句引起的从句v当as if / though引起的从句所表达的内容完全与实际情况相反或者纯粹是一种假设时，通常要用虚拟语气。如果从句表示与现在的事实相反，谓语动词用一般过去时；如果从句表示与过去的事实相反，谓语动词用过去完成时；如果从句表示与将来的事实相反，谓语动词用would (might, could) + 动词原形；They talked as if they had been friends for years.I remember the whole thing as i
4、f it happened yesterday.It looks as if it might rain.Note: 如果as if / though引起的从句所表达的内容被看作是事实或者有可能是真实的，则要用陈述语气。It seems as if it is going to rain.The meat tastes as if it has already gone bad.大9. lest, for fear that和和 in case引起的从句引起的从句v当lest, for fear that和 in case表示“以免，以防，生怕，惟恐”等时，在它们引起的从句中，谓语动词常用sh
5、ould + 动词原形。He ran away lest he should be seen.Hes working hard for fear that he should fall behind.He left early in case he should miss the last train.10. If only引出的从句引出的从句vIf only引出的从句用以表达感叹性的愿望，常译为“要是就好了”。If only从句经常省略结果主句，且主要用在虚拟语气中，即从句的谓语动词用一般过去时表示现在或将来不可能实现的愿望，或用过去完成时表示过去没有实现的愿望。If only the ra
6、in would stop.If only Id listened to my parents.Note: if only引出的句子偶尔也可使用陈述语气，但考生须注意的是，在各类测试中一般都以用虚拟语气为正确答案。11. would rather（that）引出的从句）引出的从句vwould rather意为“宁愿”，接从句时常省略关系代词that。would rather后的从句要用虚拟语气，即从句谓语动词用一般过去时表示现在或将来的愿望，用过去完成时表示与过去事实相反的愿望。Id rather you told me the truth.I would rather you came to
7、morrow than today.Id rather you hadnt told me about it.12. It is (about/high) time (that) 句型句型v该句型表示“（早）该做”，其后的定语从句中的谓语动词要用虚拟语气表示。在测试中从句的谓语动词用一般过去时。It is time that we went to bed.It is high time that somebody taught you to behave yourself.13. 表示猜测的几种不同的方法及意义表示猜测的几种不同的方法及意义v一些情态动词与动词的完成式连用能够表示对过去情况的猜
8、测或者未实现的可能性。1) could have + 过去分词A. 表示对过去可能发生的事情的推测，意为，“可能做了某事”。He couldnt have seen her yesterday.They could have lost their way.B. 表示某事在过去本有可能发生，但事实上并未发生，意为，“本可以做某事”。We could have started a little earlier.I could have killed her. It was a narrow escape.v2) may (might) have + 过去分词A. 表示对过去情况的推测，意为，“可能
9、已做某事”。He may have heard the news.I might have come to a wrong conclusion.B. 表示一种未实现的可能性，即本可以做某事，而实际上并没有做，有时含有抱怨的口吻。It was a narrow escape. You might have killed yourself.A lot of men died who might have been saved.v3) must have + 过去分词表示逻辑上的必然性，即按照某些现象推断过去肯定发生过的某事。She must have made a big mistake.The
10、 city at one time must have been prosperous, for it enjoyed a high level of civilization.v4) neednt have + 过去分词表示过去不必做某事，但已经做了，即本可不必做某事。You neednt have woken me up. I dont have to go to work today.He neednt have watered the flowers, for it is going to rain.5) should / ought to have + 过去分词表示过去应该做某事而实
11、际上没有做。You should / ought to have done what your parents told you. (But you failed to do it.)You should / ought to have been more careful. (But you werent.)v6) shouldnt / oughtnt to have + 过去分词表示过去不应该做某事而实际上却做了。You shouldnt / oughtnt to have crossed the road when the lights were red. (But you did.)They shouldnt / oughtnt to have left so soon. (But they did.)7) would have + 过去分词表示对现在或将来某时之前业已完成的动作的推测。可译为，“可能”、“也许”、“想必”。He would have arrived by now.She would have recovered by then.