【语法】虚拟语气 1

(完整版)英语虚拟语气语法归纳总结

（完整版）英语虚拟语气语法归纳总结英语中的虚拟语气是一种表示非事实或想象的语气，用来表达对现实情况的猜测、愿望、要求、建议、命令和反讽等。

虚拟语气主要通过动词的形式和句子的结构来表达。

一、虚拟语气的用法：1.表达建议、要求、命令、禁止：- 主语+动词原形+宾语（动词原形要用动词底形、如be）；- 主语+动词原形+that从句（用于表达建议、命令、禁止，动词原形用“should + 动词原形”或用情态动词）。

例句：- It is important that he be present at the meeting.（建议）- I suggest that he should go to the doctor.（建议）- They insisted that he leave the room immediately.（命令）2.表达愿望、请求、要求：-主语+动词过去式；- 主语+would/could/might + 动词原形；- 主语+动词过去式+宾语+should + 动词原形。

例句：- I wish I could fly.（愿望）- I would appreciate it if you could help me.（请求）3.表示虚拟条件：- If条件从句中的谓语动词用过去完成时，主句用would/should/might/could + have + 过去分词；- If条件从句中的谓语动词用过去时，主句用would/should/could + 动词原形。

例句：- If I had known his phone number, I would have called him.（虚拟条件）- If you had listened to me, we could have finished the project earlier.（虚拟条件）4.表达建议、要求、祝愿：- If only内部称述 + 主语 + 过去式。

英语语法虚拟语气的知识点归纳

英语语法虚拟语气的知识点归纳一、虚拟条件句(一)含有if条件句的主从句的虚拟语气总结：1. If 条件句中谓语动词的虚拟结构是在原来陈述语气所用时态的基础上倒退一个时态（对将来虚拟的were to do/should do例外）2. 主句要借助于情态动词的过去式，后跟动词原形（现在或将来）或have done(过去)；if条件句中只出现一个情态动词，即对将来虚拟的should.3.做此类题目时一定要分清是从句还是主句谓语动词的虚拟，还要把握好时态。

注意：1. 在虚拟条件从句中，动词“be”的过去时态一律用”were”，不用was。

2. 在虚拟条件状语中如果有were, should, had这三个词中任何一个，可省略if，把这三个词提到主语之前, 变成：were/should/had +主语+剩余成分。

3.在虚拟条件状语从句中，省略连词的倒装形式的句首不能用动词的缩略形式。

如我们可说Were I not to do., 而不能说Weren‘t I to do。

4.在表示与将来事实相反的条件句中，只能用should，而不能用would，could和might 等。

5.主句中的should通常用于第一人称，would，could以及might 可以用于各种人称eg :①If I were a bird, I could fly in the air.如果我是一只小鸟，我就能在空中飞行。

②I wish I could pass the examination.我希望我能通过考试。

在虚拟条件句中，对于与将来事实相反的情形，请注意以下几点：（1）条件从句表示的内容与将来事实相反，实为对将来情况的推测，用过去时表示虚拟；（2）条件从句谓语除用过去式外，有时也用“should+动词原形(表示可能性极小，常译为“万一”)”或“were to+动词原形(表示与将来事实相反的假设)”；（3）条件从句使用“should+动词原形”这样的谓语形式时，主句谓语除可用“should (would, could, might)+动词原形”这样的虚拟语气形式外，也可用直陈语气或祈使语气。

英语语法之虚拟语气

虚拟语气
分类
1.if虚拟条件句 2.其他句式虚拟 3. 名词性从句中的虚拟
分类
1.if虚拟条件句
如果我是个女孩，那我就……
If I am a girl, I will …
如果我是个女孩，那我就……
If I am a girl, I will …
were
would
判断下面两件事，发生可能性的大小。
I am hungry now because I didn’t eat dinner.
如果我吃了晚饭，现在就不饿了。
If I had eaten dinner, I wouldn’t be hungry now.
The room is full of flies because you left the door open.
If it ______ tomorrow, the match would be put off. A. were to rain B. was to rain C. was raining D. had rained
If it ______ tomorrow, the match would be put off. A. were to rain B. was to rain C. was raining D. had rained
蓝教练是女教练，吕教练是男教练。蓝南是男篮主力，吕楠是女篮主力。吕教练在男篮训练蓝南，蓝教练在女篮训练吕楠。
没有大量练习，你就发不对音。
蓝教练是女教练，吕教练是男教练。蓝南是男篮主力，吕楠是女篮主力。吕教练在男篮训练蓝南，蓝教练在女篮训练吕楠。
没有大量练习，你就发不对音。
But for much practice，you could not pronounce correctly.

(完整版)高中英语语法虚拟语气讲解

高中英语语法讲解--虚拟语气1。

语气的定义和种类(1）语气的定义语气是动词的一种形式，它表示说话人对某一行为或事情的看法和态度。

（2）语气的种类A. 陈述语气表示动作或状态是现实的、确定的或符合事实的，用于陈述句、疑问句和某些感叹句。

We are not ready.Did it rain all day yesterday？What a fine day today!B. 祈使语气表使说话人的建议、请求、邀请、命令等。

Be careful.Don’t forget to clo se the window.Open the door， please。

C。

虚拟语气表使动作或状态不是客观存在的事实,而是说话人的主观愿望、假设或推测等.2。

虚拟语气一. 虚拟语气在条件句中的应用学习虚拟语气在条件句中的用法之前我们必须清楚条件句的种类：条件句有真实条件句与非真实条件句(或称虚拟条件句）两种。

真实条件句所表的假设是可能发生或实现的，句中的条件从句与结果主句都用陈述语气。

如：If it doesn’t rain tomorrow, I will go for a picnic。

假若明天不下雨,我就去野餐.Oil floats if you pour it on water. 你如把油倒在水里，油就浮起来。

虚拟条件句所表的假设则是不可能或不大可能发生或实现的，句中的条件从句与结果主句皆须用虚拟语）, 主句的谓语用should （would, might， could）+动词原形。

如：If it were not raining, we should go for a picnic.如果现在不下雨的话，我们就出去野餐了。

（事实是：天在下雨，我们不能出去野餐.表示愿望。

）If he came here, he might be able to help you. 如果他来这，他就能够帮助你了。

（事实是：他没来这，他不可能帮助你。

高中英语语法讲解——虚拟语气

2.这类主语从句常常用于表示要求、建议、命令、请求、提议等，其谓语形式往往为 “ （ should）+ 动词原形 ” 的形式。在美国，常省略should，而在英国，则往往不省略should。
比如：
--It is necessary that the machine (should) be oiled everyday. 机器必须天天上油。
1.1.1.和现在事实相反的非真实条件句
这类非真实条件句表示和现在事实相反的情况。比如： --I would/should certainly go if I had the time.
如果我有时间，我一定会去的。 --If I were your father, I would criticize you more
--I never expected that the problem should be so complicated.
我从未想到问题会如此复杂。
--They just couldn’t believe that the new stadium should be so big.
他们简直不能相信新的体育馆会如此大。
--The teacher insisted that all the students (should) be on time.
老师要求学生们准时到校。
--He suggested that the regulations (should) be revised. 他建议修改规则。
The lawyer asked that the case (should ) be postponed for one month. 律师要求案子往后推迟一个月。

语法：虚拟语气(一)在if 条件从句中的用法;词汇：选修6 (Unit 1)中的重点词句与表达

had+done would/could/should/might had + done+ have donedid; should + do; ere to do would/could/should/ mightdwere to do+ doYou could answer most of the questions now if you had reviewed the lessons last night.Maybe if I ____ science, and not literature then, I would be able to give you more help. (2011,北京卷30)A. studiedB. would studyC. had studiedD. was studying_____ I you, I would go with him to the party.But for their help, we ____ the program in time. (2009,安安徽卷，I was ill that day. Otherwise, I would have taken part in the sports meeting.They would have resisted but that they lacked courage. （= They would have resisted if they hadn’t lackedA A man who stopped drinking water would be dead in about 3days.possession possess [pə'zes]vt. 拥有；具有；支配有有支Rich people wanted to possess their own paintings, sothey could decorate the superb palaces and great houses.they could decorate the superb palaces and great houses(选修6, P 2-18）1.2.The , painter does not attempt to paint objects as we see them with our eyes, but instead concentrates on certain qualities of the object, using colour, line and shape to represent them. (选修6, P3-53)1k ff t t ith t di1.make an effort, try, esp. without succeedingHe attempted to leave but stopped. 【L.C】attempt to do; attempt doing总结一、虚拟条件句的用法回顾二、虚拟条件句的用法补充（三种变体）1、错综复杂句2、省略if 的条件句条件3、含蓄条件句三、重点词汇。

英语语法：虚拟语气

虚拟语气用法详解一、条件句中的虚拟语气1. 条件句中虚拟语气的形式从句中提出一种与客观现实不相符或根本不可能存在的条件，主句会产生的一种不可能获得的结果。

条件句中的虚拟语气根据不同的时间有三种不同的形式。

2.条件句中的虚拟语气的举例(1) 将来时的条件句中的虚拟语气。

如：If he should go to Qing Hua University, he would make full use of his time. 如果他要上清华大学的话，他就会充分利用他的时间了。

If he were to come here, he would tell us about it. 如果他要来的话，他会通知我们一声。

(2) 现在时的条件句中的虚拟语气。

如：If he were free, he would help us. 要是他有空的话，它会帮助我们的。

If he studied at this school, he would know you well. 如果他在这所学校学习的话，它会对你很熟悉。

(3)过去时的条件句中的虚拟语气。

如：If I had seen the film, I would have told you about it. 我如果看过这场电影，我会把电影内容告诉你了。

If I had got there earlier, I would have met Mr. Li. 如果我早点到那儿，我就会会到了李先生。

3. 运用条件句中的虚拟语气时，须注意的几个问题(1)当从句的主语为第三人称单数时，谓语动词若是系动词be时，可用was 代替were。

但在倒装虚拟结构及if I were you, as it were 中，只能用were。

如：Were I ten years younger, I would study abroad. 要是我还年轻十岁的话，我会去国外学习。

If I were you, I would try my best to grasp the chance. 要是我是你的话，我要尽力抓住这次机会。

高中英语语法系列--虚拟语气讲义

虚拟语气虚拟语气表示说话人的主观愿望、猜测、建议或与事实不符的假设等，也可以表示可能性较小的情况或不可能发生的情况，而不是客观存在的事实(表示客观事实要用陈述语气)。

虚拟语气是由句中谓语动词的特殊形式表现出来的。

虚拟语气常用于复合句中，也可用于简单句。

比较：If she asks me tomorrow,I shall do it.如果她明天请求我，我会做的。

(陈述语气，说话人认为请求的可能性大)If she asked me tomorrow, I should do it. 假如她明天请求我，我会做的。

(虚拟语气，说话人认为请求的可能性小或不可能请求)1 虚拟语气的用法1-1 虚拟语气用于条件状语从句中1)表示与现在事实相反的情况If I were/was not busy today, I should go with you.如果我今天有空，我会同你一起去的。

If he were/was here,he might talk with you.如果他在这里，他可能会同你谈谈。

If I were you,I wouldn't accept her suggestion.如果我是你，我不会接受她的建议。

If I knew the answer to the question,I should/ would tell you.如果我知道问题的答案，我当然会告诉你。

If we left now, we should/would arrive there in time.如果我们现在就动身，我们会准时到达那里。

If he didn't do exercise every day,he wouldn't be so strong.如果他不每天锻炼，他不会那样强壮的。

If it weren't raining, we would go fishing.要是现在不下雨，我们就去钓鱼了。

【精品】高中英语语法讲解：虚拟语气

高中英语语法讲解：虚拟语气一、概述：1.虚拟语气用来表示一个说法并非真实情况，而是说话人的想象假设或主观建议。

2.与虚拟语气相对应的是陈述语气，表示该说法是真实的，符合现实的，用于陈述句、疑问句、感叹句等。

3.虚拟语气的构成有两种：(1) (should) do(2) 时态倒退与现在事实相反：一般现在时do→一般过去时did；be动词(am/is/are) 都变were与将来事实相反：一般将来时will do→过去将来时would do与过去事实相反：一般过去时did→过去完成时had done二、使用虚拟语气的11种情况1.表示“建议、命令、要求、坚持”的词+ should 虚拟语气, 表示“应该做某事”，should 可省略。

常见此类单词有：suggest/suggestion, advise/advice, recommend/recommendation, propose/proposal, order/command/demand, urge, require/request, insist等。

He made a suggestion that TV series (should) not take up too much of students' time.It was demanded that a doctor (should) be called in immediately to save the general's life.注：(1) suggest意为“暗示、表明”(2) insist意为“坚持说、坚持认为”时，后加陈述语气，表示真实情况。

What he said suggested that he wasn’t in favor of watching too much TV.She insisted that she was (be) right and (should) not be punished (not punish).2.在句型It's important/vital/necessary/essential/natural/a pity/shame/strange/... that...中用should虚拟语气，表示“应该/竟然做事某”，should一般不省。

2019年12月英语四级语法之虚拟语气(1)

为备考英语四级的同学们整理了2019年12月英语四级语法之虚拟语气(1)，希望可以为大家带来帮助，预祝大家高分通过大学英语四级考试。

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时。

If I had got up a little earlier, I wouldn’t 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 tomorrow, I would not go out with you.
1。

语法系列复习专题----虚拟语气

高二语法系列复习专题-----虚拟语气(I)Class __________Name__________虚拟语气是通过特殊的谓语动词形式来表达的愿望、假设、怀疑、猜测或建议等语气，它不表示客观存在。

一、虚拟语气在单句中的用法常用来表示祝愿、采用固定的倒装句式。

例如：Long live the People ’s Republic of China! 中华人民共和国万岁！be happy! 快乐！have a good time! 玩得愉快！ succeed!成功！ make progress! 进步！[小试身手]( )1. You can see a large signal on the wall ：＿＿＿＿!A. Long lives the PRCB. Long live the PRCC. Long does the PRC liveD. Long do the PRC live( )2. Let ’s drink to our friendship. ＿＿＿＿＿!A. Long lives our friendshipB. Long live our friendshipC. Long does our friendship liveD. Long do our friendship live( )3. You can see a large signal on the wall ：＿＿＿＿!A. Down falls the Gang of FourB. Down fall the Gang of FourC. Down does the Gang of Four fallD. Down do the Gang of Four fall( )4.Tomorrow you will go to a job interview. So _______.A. you may succeedB. may you succeedC. succeed you mayD. you should be succeed( )5. What I want to say is this, _______________!A. may all the happiness follow you foreverB. all the happiness follow you may foreverC. follow you may all the happiness foreverD. you may follow all the happiness forever二、虚拟语气在条件句中的用法：两个要素:1)fact 2)tense1．在非真实性条件句与主句中的用法如果我是你，我会接受邀请的。

虚拟语气英语语法知识点

虚拟语气英语语法知识点虚拟语气是英语语法中的一种特殊的语态，用于表达虚构、假设、愿望、建议或批评等情态。

以下将介绍虚拟语气的形式、用法以及常见的虚拟语气形式等相关知识点。

一、虚拟语气的形式英语语法中虚拟语气有两种时态形式：过去时和过去完成时。

这两种时态的虚拟语气形式的形式不同，但它们都用于表达未实现的情况、假设和愿望等。

1. 过去时的虚拟语气在过去时的虚拟语气中，动词以“were”作为一般过去时态的第二人称单数和所有人称的形式，而不是“was”。

例如，“I wish I were there with you”中的“were”是虚拟语气的形式。

2. 过去完成时的虚拟语气在过去完成时的虚拟语气中，助动词“had”和过去分词构成了动词的虚拟语气形式。

例如，“If I had known earlier, I would have come to the meeting”中的“had known”是虚拟语气的形式。

二、虚拟语气的用法虚拟语气通常用于以下几种情形：1. 假设虚拟语气常在假设条件中使用，表达一种假设的情况。

例如，“If I were a millionaire, I would buy a house by the beach”中的“were”就表达了一个假设的情况。

2. 愿望虚拟语气还可以表达对于未实现的愿望。

例如，“I wish I had more time to study”中的“had”就表达了这样一种愿望。

3. 建议虚拟语气在建议中也很常见，通常表达一种可能或者有可能的情况。

例如，“If I were you, I would talk to your boss about the matter”中的“were”就表达了一种可能或者有可能的情况。

4. 批评虚拟语气也可以用于指责或者批评某人的做法或者行为。

例如，“You should have told me earlier so I could have attended the meeting”中的“should have told”就表达了一种批评的情况。

大学英语四级考试语法系列讲座--虚拟语气1

大学英语四级考试系列讲座虚拟语气中国地质大学（武汉）外语学院许峰虚拟语气是英语动词的一种特殊形式，表示说话人主观上所说的话并不是事实，而是一种假设、愿望、建议、请求、命令、空想、猜测、必要性和可能性等。

虚拟语气是英语学习中的一个难点，也是大学英语测试中的重要的语法考点之一。

测试内容涉及到虚拟语气的方方面面——从在含非真实条件的主从句中的应用，到在各种从句(主语从句、宾语从句、表语从句、同位语从句、状语从句、定语从句)中的应用。

由于虚拟语气表达的是一种与事实相反的行为或状态，其谓语动词的变化不同于陈述语气，这也是学生感到困惑和容易出错的地方。

解此类试题时，关键是要迅速发现解题信息词，确定虚拟语气类型，然后按各类虚拟语气的特定表达方式，或根据结构或题句中的其他暗示，确定动词的形式。

第一节虚拟条件句一、虚拟语气在非真实条件句中的应用非真实条件句表示不大可能或不可能发生或实现的假设，句中的条件从句与结果主句皆须用虚拟语气。

其虚拟语气的时态可用下表表示：例1：If we left now, we should arrive in good time. 假如我们现在就走的话，我们就能及时到达。

(与现在事实相反)例2：If he had been here, he might have been able to help us.如果他在这里，他也许能帮助我们。

(与过去事实相反)例3：If you did that again, we wouldn't allow you to work with us.如果你再那么干，我们就不让你跟我们一起工作了。

(与将来事实相反)经典考点1：If the whole operation be fore hand, a great deal of time and money would have been lost.(CET-4，1999年6月)A)was not planned B)has not been plannedC)had not been planned D)were not planned巧解答案C。

高中英语2020届二轮复习语法专项虚拟语气教案 (1)

虚拟语气一、【知识精讲】（一）虚拟语气的三种基本形式1.与现在事实相反一般过去时/were（从句）would/should/could/might＋动词原形（主句）2.与过去事实相反had＋过去分词（从句）would/should/could/might＋have＋过去分词（主句）3.与将来事实相反一般过去时/were to＋动词原形/should＋动词原形（从句）would/should/could/ might＋动词原形（主句）If he were/was here now, I could ask him the question. 如果他现在在这儿，我就可以问他这个问题。

If it rained/were to rain/should rain tomorrow, I would not go to Beijing. 如果明天下雨，我就不去北京了。

If he had told me his telephone number yesterday, I would have phoned him. 如果他昨天把电话号码告诉我，我一定会给他打电话。

（二）错综时间虚拟语气前面介绍的三种基本形式的虚拟语气，其if从句中谓语动词的动作与主句谓语动词的动作发生的时间是一致的，即同为现在、过去或将来。

但是当二者动作发生的时间不一致时，主句和从句各自的谓语形式要根据它们动作发生的时间按照上述原则作适当调整。

常见的错综时间是：从句表示过去，主句表示现在，即If...had＋过去分词..., ...should/would/could/might＋动词原形。

If she had followed the doctor's advice, she would be quite all right now. 如果(当初)她听从了医生的劝告，她现在就没事了。

If the young tree had been watered, it wouldn't die now. 如果给那棵小树浇了水，它现在就不会死了。

虚拟语气语法

虚拟语气语法
一、定义
1、虚拟语气：虚拟语气是一种表示假设情况或者表达愿望、责备、建议等的语法结构，而不是实际发生的事情。

2、虚拟语法：虚拟语法是利用虚拟语气，表示一种假如推测的情况。

二、动词形式
1、虚拟条件句：利用“were / should / had”等，用于表示与现实事实相反的假设条件的句子中；
2、虚拟请求句：利用“could / would / may”等，用于表示主句中的虚拟请求；
3、虚拟责备句：利用“ought to / should have / had better”等，用于表示责备；
4、虚拟建议句：利用“had better / let us”等，用于表示建议。

三、应用场景
1、假设条件：如果你有足够的时间，你可以学习更多知识；
2、请求：如果可以，请帮我一把；
3、责备：你本该事先做准备的；
4、建议：咱们最好早点出发去某地。

四、虚拟语气的特点
1、表示的是假设情况或者愿望、责备、建议等；
2、语法结构简单，用于句子中的主句语态发生变化；
3、句子的时态有时会利用不同的语法来表示。

例如：“虚拟条件句”中的主动语态会变成被动语态，表示一种假如推测的效果；
4、有时会使用特殊的情态动词来表示；
5、虚拟语气会给句子添加强烈的语气，从而增加句子的表达力。

高中语法精讲虚拟语气

高中语法精讲虚拟语气(1)对现在的虚拟If从句主句did/were would/should/could/might doIf I were you, I would tell her the truth.=Were I you, I would tell her the truth.If条件句的倒装:去掉if, 句子部分倒装(半倒装，即以前学过的一般疑问句的语序)备注虚拟语气中，不管主语是不是单数都用were(2)对过去的虚拟If从句主句had done would/should/could/might have doneIf you had taken my advice, you would have passed the exam.=Had you taken my advice, you would have passed the exam.省略if(3)对将来的虚拟If从句主句did/should do/were to do would/should /could/might doIf he didn't come tomorrow, we would put off the meeting.=If he should come tomorrw, we would put off the meeting.=If he were to come tomorrw, we would put off the meeting.总结主过将从过主过将完从过完[例1](陕西卷)If we ___the other road, we might have arrived here in time for the meeting.A. takeB. had takenC. tookD. have taken答案B主句是过将完，所以从过完，过去完成时[例2](天津卷)--John went to the hospital alone.--If he___me about it, I would have gone with him.A. should tellB. tellsC. toldD. had told答案D[例3] (2013重庆)- It rained cats and dogs this morning. I'm glad we took an umbrella.- Yeah, we would have got wet all over if we__A. hadn'tB. haven'tC. didn'tD. don't答案A省略特殊情况①错综时间条件句例: If you had followed my advice just now, you would be better now.If you had studied hard before, you would be a college student now.做题时注意:动词的形式根据它所表示的时间作出相应的调整。

英语语法-虚拟语气

IV. clause
• 1. …suggest/propose/recommend/demand/ord er/command/desire/require/request/insist/stipulate/ adivised/decide that … (should) do… • 2. …suggestion/proposal/recommendation/de mand/order/command/desire/request/requirement/i nsistence/stipulation/advice/decision that …(should) do… • 3. It is/was advisable/desirable/suggested/requested/ordered/p roposed/decided that …(should) do
在It is /was +形容词后的that从句中常用“should + 不定式”表示建议、惊奇等。每式英语中省略should。这类常见的形容词有： advisable, appropriate, essential, necessary, possible, preferable, proper等。 It’s advisable that the Sport Meets be put off owing to the bad weather. 在使用if的代用语及其省略的句子中,后接过去式常见代用语有：provided (that), supposing/suppose, in case of, otherwise等。 Supposing the ship were to sink, do you think there would be enough life jackets for all the passengers?

高中英语语法——虚拟语气

高中英语语法——虚拟语气一、概念介绍虚拟语气是一种语法形式，用于表示说话人的假设、愿望或建议。

在英语中，虚拟语气有以下两种形式：1. 虚拟语气（过去式）虚拟语气（过去式）表示说话人对于事实的怀疑、建议或表示条件。

在虚拟语气（过去式）中，动词的过去式形态用来表达假设的情况。

Eg. If I were rich, I would buy a mansion.（如果我富有，我会买一个大别墅。

）2. 虚拟语气（完成时）虚拟语气（完成时）表示对于过去某个事件的假设、猜测或懊悔。

在虚拟语气（完成时）中，动词的完成式形态用来表示这种情况。

Eg. If I had known that you were coming, I would have prepared dinner.（如果我知道你要来，我会准备晚餐的。

）二、虚拟语气的使用1. 虚拟语气（过去式）的使用1.1 表达愿望用于表示与现实相反或者不可能实现的愿望，用“would”或者“could”引导子句。

在这个情况下，如果主句是过去时，引导虚拟语气的子句需要用“were”代替“was”。

Eg. If I were you, I would go to college.（如果我是你，我会去上大学。

）1.2 表达建议用于表示对于事情的建议或者对于对方的请求，通常使用“should”或者“would”。

Eg. If you want to lose weight, you should eat less.（如果你想减肥，你应该少吃一点。

）1.3 表达猜测用于表示对于不确定的情况的猜测或者假设，常常使用“might”或者“could”。

Eg. If he were here, I might ask him to help us.（如果他在这里，我可能会请他帮助我们。

）1.4 表示虚构的情况用于表示一些不真实的情况，这些情况不可能发生或者不符合事实。

Eg. If I won the lottery, I would quit my job.（如果我赢了彩票，我会辞职的。