中考英语句型精讲假设法句型.doc

中考英语句型精讲假设法句型中考英语句型精讲假设法句型中考英语句型精讲假设法句型If + Present Tense ..., S + will/shall + V ...结构︰If＋现在式…，S＋未来式…说明︰if 子句用现在式，表示须具备的条件，主句用未来式表示可能的结果，整句含意为“如果…，那么…” will 用于所有的人称，在 I 和 we 之后可用 shall 代替 will若主句的主词为 I 或 we 时，可以用 shall 代替 will像 if necessary（如果需要） ，if possible（如果可能） ，if so（如果这样）等固定片语实际上是省略了的 if 子句If I lose my job, I will/shall go abroad. 如果我失业了，我就出国If I have a headache, I will take an aspirin. 如果我头痛，我就服一片阿斯匹林If it rains, we will stay at home. 如果下雨，我们将待在家里If the weather clears, we’ll go for a walk. 如果天晴，我们就去散步。

If the weather doesn’t clear, we won’t go for a walk. 如果天不晴，我们就不去散步Inflation may be rising, if (it is) so, prices will go up.通货膨胀率可能上升如果是这样，物价就会上涨If possible, She wants to go with us. 可能的话，她想跟我们一起去Sterling may fall, if (this should be) so, interest rates will rise.英国货币可能贬值，如果果真如此，利率就会上升If + Present Tense ..., S + Modal Verb ...结构︰If + 现在式，主词＋情态助动词说明︰本句型实为句型之变体之所以用情态助动词，主要是因为说话者对可能的结果不是太肯定或者是想表达例如必要的意思If it is fine tomorrow, we can go out. 如果明天天气好，我门可以出门If it is fine tomorrow, we could go out. 如果明天天气好，我门能够出门。

If it is fine tomorrow, we may go out. 如果明天天气好，我门可能出门If it is fine tomorrow, we might go out. 如果明天天气好，我门可能出门If it is fine tomorrow, we should go out. 如果明天天气好，我门宜于出门If it is fine tomorrow, we ought to go out. 如果明天天气好，我门宜于出门If it is fine tomorrow, we must go out. 如果明天天气好，我门必须出门If I should ..., Imperative Sentence.结构︰If I＋should ...＋祈使语气说明︰代替，增加了条件的不确定性本句型常用在想礼貌地提出要求或建议，或者想圆通地告诉他人该做什么事的场合用 should 起始句子即可不用 if 而表示条件这种用法比较正式，常用于诸如公函之中，而不用于日常会话If you should see him, please give him my regards. 如果你见到他，请代我向他致意。

Should you see him, please give him my regards. 如果你见到他，请代我向他致意If you should happen to see him, please give him my regards.如果你万一见到他，请代我向他致意Should you happen to see him, please give him my regards.如果你万一见到他，请代我向他致意If you should write to her, send her my love. 如果你给她写信，请代我向她问候Should you not wish our agent to call, please let us know.你若不希望我们的代理人去造访，请告之Should you be interested in our offer, please contact us.你若对我们的报价感兴趣，请与我们联系If I should ..., I will ...结构︰If…should…，…would（will）／should（shall）等＋原形动词说明︰这是表示与未来事实相反的假设，if 要用 should，译成“万一” 。

should 可置于前，将 if 省略的则视可能性做变化：若可能性低，则为过去式，若可能性高，则为现在式should 可以提前，而将 if 省略If he should come, I would tell him the truth. 万一他来，我会把真相告诉他If he should come, I will tell him the truth. 万一他来，我一定会把真相告诉他Should the boy come again, I would throw him out. 要是那男孩在来，我就把他撵出去If it should rain, our plan would be spoiled. 万一下雨，我们的计划就泡汤了Should that be true, the contract would be canceled. 假如那是真的，合约就该取消Should another world war break out, what would become of human beings?万一另一次世界大战爆发，人类将会发生什么事？If I were to ..., I ...结构︰If…were to…，…would／should 等＋原形动词说明︰这也是表示与未来状况相反的假设，与“if ... should, ...”大致相同，但“if ... were to”所表示的可能性更低，通常用以表示“与真理相反”的。

If the sun were to rise in the west, he would pass the exam.要是太阳从西边出来，他就会通过考试－－他不可能通过考试If I were to be born again, I would like to be a bird. 我要是再活一次，我想当一只鸟If the sun were to disappear, what would the earth be like?万一太阳消失了，地球会变成什么样子？Were I to die tomorrow, what would my children do?万一明天我死了，我的孩子们将怎么办呢？If I + V-ed, I would ...结构︰If…＋过去式动词…，主词＋过去式助动词（would／should 等）＋原形动词说明︰这是与现在事实相反的假设句型if 中的，不论为第几人称，一律用 were，were 可置于主词前面，而省略 if过去式除用 should（用于第一人称） 、 would（用于第二、三人称）外，还可用不分人称的 could，might 和 ought to，它们与原形结合起来构成。

If I knew his address, I could write to him. 如果我知道他的住址，我会写信给他If I were free now, I might call on him. 如果我有时间，我可能会去看他If you were in my shoes (=Were you in my shoes), what would you do?如果你站在我的立场，你会怎么做？Were I rich enough, I would buy a sports car. 如果我有足够的钱，我就买一辆赛车了How happy I would be if I were a few inches taller! 要是我再高几寸，我会好高兴If I had a car, I could take her for a drive. 如果我有车， 我就带她去兜风了If I had binoculars, I could see that comet clearly.如果我有望远镜，我就可以清楚地看见那颗彗星It is time that ...结构︰It is（high）time＋（that）＋主词＋过去式动词说明︰此句型意为“已经到了…的时间了” 。

过去式处有时亦使用“should＋原形” that 也能用 to 来表示It is time he went to bed. 该是他睡觉的时间了It is time that you left for the duty. 该你当班了It is time that you reflected upon your mistakes. 该是你反省思过的时候了It is high time he should come to our house for dinner.已经到了他该上咱家吃晚饭的时候了It is time for somebody to teach you to behave yourself.该是有人教你应对进退之礼仪的时候了If I had V-ed, I would have ...结构︰If…had＋过去分词…，主词＋would／should 等＋have＋过去分词说明︰这是与过去事实相反的假设if 要用，则要用过去式（would，should，ought to，might，could）＋have＋过去if 中的 had 可置于前面，而省略 IfIf I had seen him, I would have told him the truth. 如果我当时看见他，我会告诉他实情。

I could have finished the task if I had had more time.如果当时我能有多一点时间，我就能完成这项任务If we had known of your departure, we would have seen you off at the airport.如果我们事先知道你要离开，我们会到机场送行I someone had been with him, he might not have been drowned.如果有人在他旁边，或许他就不会溺死I might have been incredulous had I not been accustomed to such responses.若非我已经习惯了这样的回答，我可能不敢轻易相信Had he not apologize to her, she would not have forgiven him.她（那时）不会原谅他，若非他道了歉Had he not saved me, I might have been drowned. 我可能溺死了，若非他救了我Had I proposed to you, would you have married me?我要是当年向你求婚，你会答应嫁给我吗?Had you not helped us, we should ha。