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1、精选优质文档-倾情为你奉上If 分三种时态：与现在事实相反、与过去事实相反、与将来事实相反。 *条件句有真实条件句和非真实(虚拟)条件句两种。真实条件句的假设是有可能发生的，而的假想与事实相反或不大可能会发生，试比较： If I have time, I will go with them. 假若我有时间，我就同他们去。(陈述语气) If I had time, I woudl go with them. 假若我有时间，我就同他们去。() 这是对现在事实的虚拟，事实是我没有时间，所以我没有和他们去 If条件句虚拟 时态类型主句If引导的从句例句与现在事实相反would/should/could
2、/might+ V原 动词过去式 did *be 多用were1. If I were you, I should study English. 2. I would certainly go if I had time.与过去事实相反would/should/could/might + have done动词过去完成式 had done1. If you had taken my advice, you would not have failed in the test. 2. If I had left a little earlier, I would have caught the t
3、rain.与将来事实相反would/should/could/might + V原动词过去式 should +V原 were + to do1.If you came tomorrow, we would have the meeting. 2. If it were to rain tomorrow, the meeting would be put off.*规律总结：从句都往过去推一个时态，如：与现在相反的if从句就用过去时；与过去相反用过去完成时（即过去的过去）注：几点特别说明 1、l would/should/could/might 主句谓语中的should主要用于第一人称后；wou
4、ld表示结果还表示过去经常常常做某事，might表示可能性，could表示能力、允许或可能性。比较： If you tried again ，you would succeed. 要是你再试一试，你就会成功的。(would表结果) If you tried again， you might succeed. 要是你再试一试，你可能会成功的。(might表可能) If you tried again ，you could succeed. 要是你再试一试，你就能成功了。(could表能力) 2、 错综时间虚拟条件句 即条件从句与主句所指时间不一致，如从句指过去，而主句即指的是现在或将来，此时应根
5、据具体的语境情况，结合上面提到的三种基本类型对时态作相应的调整： If it had rained last night, the ground would be wet now. 要是昨晚下过雨的话，现在地面就会是湿的。 You would be much better now if you had taken my advice. 假若你当时听我的话，你现在就会好多了。 3、 If虚拟条件句的否定（含蓄条件句） 常考两个句型：If it werent for和If it hadnt been for，其意为“若不是(有)” “要不是”。如： If it werent for water,
6、no plant could grow. 要是没有水植物就无法生长。 If it hadnt been for your assistance ，we wouldnt have succeeded. =But for your assistance ，we wouldnt have succeeded. =Without your assistance ，we wouldnt have succeeded. 4、 If虚拟条件句的倒装形式，即把were, had, should置于句首。例： Were I in school again (= If I were in school again
7、), I would work harder. Had you asked me, I would have told you. (=If you had asked me,) 第二类Wish/if only/would rather愿望 和as if(though)好像从句 分时态 l Wish从句 就好了 动词过去式或were与现在事实相反 主语+wish(that)+主语 + 动词过去完成式与过去事实相反 助动词过去式+动词原形与将来事实相反I wish I were a pop singer. (=I am sorry I am not a pop singer.) I wish I
8、had never stopped teaching. (=I am sorry I stopped teaching.) I wish they would let us get some sleep. * wish与hope接宾语从句的区别在于：hope表示一般可以实现的希望，宾语从句用陈述语气。wish表示很难或不大可能实现的希望,宾语从句用虚拟语气。试比较： （1） We hope they will come. (We dont know if they can come.) （2） We wish they could come. (We know they are not com
9、ing.) l if only 后的句子用虚拟语气 要是就好了 if only 与 I wish一样，也用于表示与事实相反的愿望，其后所虚拟语气的时态与 wish后所接时态的情况相同： If only she had had more courage! 她再勇敢一些就好了。 If only I had listened to my parents! 我要是当时听了父母的话就好了。 If only she would go with me! 她要是愿意和我一道去就好了! *if only 通常独立使用，没有主句。 l would rather后句子用虚拟语气 只分现在和过去 在would rat
10、her, would sooner, would just as soon 后的that从句中, 句子谓语习惯上要用虚拟语气， 表示宁愿做什么 ，具体用法为： 一般过去时表示现在或将来的愿望 Id rather you went tomorrow (now). 我宁愿你明天(现在)去。 用过去完成时表过去的愿望 Id rather you hadnt said it. 我真希望你没有这样说过。 l as if (though) 从句用虚拟语气 以as if (as though)引导的或表语从句，有时用虚拟语气,则与wish用法相同，例： He acts as if he knew me. 他
11、显得认识我似的。 They treat me as though I were a stranger. 他们待我如陌生人。 He talks as if he had been abroad. 他说起话来好像曾经出过国。 注：两点说明 (1) 从句所表示的内容若为事实或可能为事实，也可用陈述语气： It looks as if well be late. 我们似乎要迟到了。 (2) 注意 It isnt as if的翻译： It isnt as if he were poor. 他不像穷的样子(或他又不穷)。 第三类从句中should+动词原形，should可省略 l 在 lest ，for
12、fear that( 以免) , in case (以防)引导的中的虚拟语气 She walked quietly lest she (should) wake up her roommates. 她走得很轻以免吵醒她的室友。 l 表应当做 值得做 一类动词后的宾语从句 建议advise, suggest, propose, recommend命令order, command 请求ask, demand, require, request指示direct 敦促urge提议move, vote 希望desire坚持insist 打算 intend安排 arrange ex. I insisted
13、 that he (should) stay. 我坚持要他留下。 He urged that they go to Europe. 他敦促他们到去。 He suggested that we should leave early. 他建议我们早点动身。 He ordered that it (should) be sent back. 他命令把它送回去。 I ask that he leave. 我要求他走开。 He requires that I (should) appear. 他要求我出场。 I move that we accept the proposal. 我提议通过这项提案。 H
14、e arranged that I should go abroad. 他安排我去国外。 She desires that he do it. 她希望他做此事。 The general directed that the prisoners should be set free. 将军指示释放那些俘虏。 *suggest表“暗示”insist表“坚持认为”不用虚拟语气 比较： He insisted that I had read his letter. 他坚持说我看过他的信。 He insisted that I should read his letter. 他坚持要我看他的信。 He s
15、uggested that we (should) stay for dinner. 他建议我们留下吃饭。 I suggested that you had a secret understanding with him. 我觉得你与他心照不宣。 l order,suggestion,idea,plan, proposal, advice, demand等名词后的表语从句或同位语从句 Our suggestion is that you（ should）be the first to go 我们的建议是你应该第一个去。 *advice, agreement, command, decision
16、, decree, demand, determination, indication, insistence, order, preference, proposal, request, requirement, stipulation, suggestion, idea, plan, order l “It is (was)+ 紧急 重要- 带感情色彩 上述demand/suggest等动词过去分词 或 important,natural,strange ,necessary，surprised, appropriate等形容词 后的主语从句 1. It is ordered that t
17、he army (should) get there by 4 a.m. 2. It is necessary that she (should) be sent there at once. *It is necessary，important，strange，natural， advisable, anxious, compulsory, crucial, desirable, eager, essential, fitting, imperative(绝对必要), impossible, improper, obligatory, possible, preferable, probab
18、le, recommended, urgent, vital etc. ；it is a pity；It is requested/suggested/desired/proposed 第四类Its time后的从句用虚拟语气 从句谓语通常用过去式表示 (早)该干某事了 *有时也用过去进行时或“should+动词原形”(较少见，且should不能省略) ex.Its time we went were going, should go. 我们该走了。 Its time I was in bed. 我该上床睡了。(不用were) Its time = It is (the very/high/r
19、ight/about) time 至善教育将根据每位高三学生的学习方法、学习态度的不同，制定特有的学习方案，提供最全的高考英语学习策略。 wish和as if引导的虚拟1.表示与现在事实相反的愿望 构成：主语 + wish (that) + 从句主语 + 动词过去式 （be 一律用were） 例如：I wish I knew everything in the world. I wish that the experiment were a success. We wish we had wings. 2.表示与过去事实相反的愿望 构成：主语 + wish (that) + 从句主语 + wo
20、uld/could + have + 过去分词或had + 过去分词 例如：I wish that you had called yesterday. I wish that I could have gone with you last night. I didnt go to the party, but I do wish I had been there. 3.表示将来不大可能实现的愿望 构成：主语 + wish (that) + 从句主语 + would/should/could/might + 原形动词 例如：I wish that he could try again. I wi
21、sh that someday I should live on the moon. We wish that they would come soon. II. AS IF 引出的虚拟。 As if.表好像我们经常会利用一下句型来表达不能实现的虚拟状态：It is as if。 (就好象是) As if + 从句， 主句。 （好像 Sb.+ do）表达一种假设的条件。而 As if 之后的假设内容的语法结构和wish虚拟的结构一样。 L. 33 A Day to Remember 句， “As if this were not enough to reduce you to tears, y
22、our husband arrives.” 就利用了和现在事实相反的假设虚拟。新东方名师指出，要善于总结出一些学习语法的技巧，如利用对比，举例等方法进行学习。 注：Something is to happened，Im to face it。 注意事项使用虚拟条件句时要注意的几点： 1当表示的行为和主句表示的行为所发生的时间不一致时，被称为“”，动词的形式要根据它所表示的时间作出相应的调整。如： If you had followed my advice just now, you would be better now. If you had studied hard before, you
23、 would be a college student now, and you would graduate from a college in four years time. 2if 省略句 在条件句中可省略if, 把were, had, should提到句首 , 变为倒装句式。如： If I were at school again, I would study harder. Were I at school again, I would study harder. If you had come earlier, you would catch the bus. Had you c
24、ome earlier, you would catch the bus. If it should rain tomorrow, we would not go climbing. Should it rain tomorrow, we would not go climbing. 注意：若省略的条件句中的谓语动词是否定形式时，不能用动词的缩略形式。如：我们可以说：Were it not for the expense, I would go abroad now. 但不能说：Werent it for the expense, I would go abroad now. 3用介词短语代替
25、条件状语从句。常用的介词有with, without, but for。如： What would you do with a million dollars? ( = if you had a million dollars) We couldnt have finished the work ahead of time without your help. ( = if we hadnt got your help) But for the rain ( = If it hadnt been for the rain ), we would have finished the work.
26、4含蓄条件句 有时为了表达的需要，在虚拟语气中并不总是出现if引导的条件句，而通过其他手段来代替条件句。 I was ill that day. Otherwise, I would have taken part in the sports meet. (副词) He telephoned to inform me of your birthday, or I would have known nothing about it. (连词) A man who stopped drinking water would be dead in about seven days. （定语从句） I might have given you more help, but I was too busy. (连词) Everything taken into consideration, they would have raiser their output quickly. () 专心-专注-专业