if引导的条件句
if 引导的条件句
if 引导的条件句if引导的条件句表示在某种条件下，会导致另一事发生。
句式为if +从句，主句。
中文意思是“如果某事发生（或不发生），另一事就（不）发生”。
通常分以下两种情形：一、真实条件句1. if从句和主句都用一般现在时，表示客观真理或习惯和持续发生的事情。
如：If the moon goes near the earth, the tide goes high. 如果月亮离地球距离近，潮水就高。
2. if从句用一般现在时，主句用一般将来时，表示从句中的动作如果发生，那么主句中的动作也将发生。
如：If it stops raining later this afternoon, we will eat out. 如果今天下午晚些时候雨能停，我们就出去吃饭。
3. if从句用一般现在时，主句用祈使句，表示给某人提建议或命令某人做某事，及提出建议或请求。
如：If you are not likely to be in town, please let me know. 如果你不可能在城里，请让我知道。
二、虚拟条件句虚拟条件句，也称非真实条件句，表示在某种假想的条件下，将导致某事发生。
从句中所陈述的事情仅仅只是说话者的想法，不是事实，也不可能发生。
1. if从句用一般过去时（did / were），主句用would / could / should / might + do，表示现在不可能发生的事情，if 从句中所陈述的事情与现在的事实相反。
如：If I were Liu Xiang, I would train hard for the 2008 Olympic Games.如果我是刘翔，我会为了2008年奥运会努力训练。
2. if从句用一般过去时（did / were或 were to + do），主句用would / could / should / might + do。
表示将来不可能发生的事情，if 从句中所陈述的事情与将来的事实相反。
if条件状语从句语法
当句末为or not时，引导词只能用whether而不能用if.
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If 与whether 区分
1. I don’t know _____ he will come or not. 与or not 连用只能用whether
2. I don’t care of ______ he is handsome. 介词后只能用whether
3 If she__w__in_s___ (win) the prize ,we _w_i_ll_b__e_(be) happy. 4.If I __d_o_n_’__t _e_at (not,eat )so much ,I _w__il_l _g_e_t__(get) thinner.
5.If you __te_l_l __(tell) them, they __w_o_n_’__t__b_e_li_e_ve(not,believe) you. 6 I __w_i_ll_s_t_a_y_(stay) at home,If it ___ra_i_n_s____( rain). 7.If it _d__o_e_s_n_’__t ___(not,rain) ,I __w__il_l _g_o__( go) out.
5. 以下从句中will不是未来时助动词，而是情态动词。 翻译为“愿意”。
If you will excuse me,I really must go to bed . 假如你能原谅我话，我真要睡觉了。
If you will wait a minute ,I’ll go and tell my mother that you are here .
If you are free this weekend, what will you do ?
知识点名：if引导的条件状语从句
知识点名：if引导的条件状语从句讲义：if引导的条件状语从句1. if意为“如果”，引导条件状语从句时，既可放在主句前面，也可放在主句后面。
若if条件句放在句首，从句后面常加逗号与主句隔开。
If you go there, I'll go, too.如果你去那儿，我也会去。
My mother will take me to the park if she is free.如果我妈妈有空，她就会带我去公园。
2. 时态运用：在含有if引导的条件状语从句的主从复合句中，主句为下列情形之一的，条件状语从句通常用一般现在时。
(1) 主句是一般将来时，即遵循“主将从现”的原则。
If he comes, he will bring his violin.如果他来，他就会把他的小提琴带来。
(2) 主句是含有情态动词may/might/can/must/should等的句子。
If you want to lose weight, you must eat less bread.如果你想减肥，你必须少吃面包。
(3) 主句是祈使句。
If you are not strong enough, please don't take part in such an activity.如果你不是很健壮，请不要参加这种活动。
3. 句型转换：(1) 借助“祈使句+and/or+陈述句（一般将来时）”这一句型来转换。
其中，在句意上and表示顺承；or表示转折，意为“否则”。
If you work hard, you'll pass the exam easily.=Work hard, and you'll pass the exam easily.努力学习，你将很容易通过考试。
Work hard, or you won't pass the exam easily.努力学习，否则你不会轻易地通过考试。
If引导的条件状语从句
If引导的条件状语从句很多英语学习者都觉得If引导的条件状语从句这个句型很难，学习起来很吃力。
下面是店铺为你整理的If引导的条件状语从句的相关资料，希望大家喜欢!If引导的条件状语从句用法1.if引导的条件状语从句可以放在主句之前，也可以放在主句之后，如果放在主句之前，中间要用逗号将主句和从句隔开。
例如：If I am free, I will come to see you.= I will come to see you if I am free.如果我有空，我就来看你。
2. 在含if引导的条件状语从句的复合句中，主句用一般将来时，从句通常用一般现在时态表示将来意义，即“主将从现”原则。
例如：If it snows tomorrow, we will go skiing.如果明天下雪，我们就去滑雪。
3. 在含if引导的条件状语从句的复合句中，语句的谓语还可含有情态动词can、must、may等，主句也可是祈使句。
例如：If it stops raining, we can go out.如果雨停了，我们就能出去。
4. 在含if引导的条件状语从句的复合句中，如果主句部分描述的是客观事实或真理，要用一般现在时。
例如：If you heat the ice, it turns into water.如果你加热冰，它就会变成水。
if引导的非真实条件句对过去的虚拟条件从句(if):主语+had done 主句might/would/should/could+have done对现在的虚拟if+ 主语+动词过去式(be用were)主句might/would/should/could+do对将来的虚拟if+主语+动词过去式(be用were)或主语+should do或主语+were to do主句 might/would/should/could+doe.g.Tom got to the station in time because he started earlier.If Tom had started late, he would have missed the train.Do you think the thief entered through the door?No, if he had, I don't believe, he would have broken the living room window.If the book weren't so expensive, I would buy it.If you didn't live so far away, we would be able to visit you more.What would you do if you lost your passport in a foreign country?Why hasn't he come? If he should not come on time, we would have to put off the trip.2.注意事项e.g.If she hadn't work hard at English in the past, she wouldn't work as well as a secretary in a large company now. 混合时间的虚拟语气从句为对过去的虚拟，主句是现在。
if引导的条件句是什么从句
if引导的条件句是什么从句if 引导的条件句有真实条件句和非真实条件句两种；1、真实条件句：叙述真实可能发生的事情；例句：If you fail in the exam,you will let him down.如果你考试不及格，你会让他失望的。
扩展资料2、非真实条件句：虚拟语气的一种，表示与实际已发生事实相反：例句：If I were you, I would invite him.如果我是你，我会邀请他。
3、另一个常用连词为unless,大多数时候意思与 if not 相近：例句：Let's go out for a walk unless you are too tired.我们出去散步吧，除非你太累了。
例句：If you are not too tired, let's go out for a walk.如果你不太累，我们出去散步吧。
条件状语从句的基本用法1、用if引导：if意为“如果”。
例句：If you cheat in the exam you’ll never get away with it.考试作弊必予追究。
2、用unless引导：unless的意思是“如果不”“除非”。
例句：Unless you go at once you will be late.如果你不马上走，就会迟到的'。
3、用as [so] long as引导：as [so] long as的意思是“如果”“只要”。
例句：I’ll remember that day as long as I live.只要我活着，我就不会忘记那个日子。
4、用in case引导：in case用连词引导条件状语从句时，其意为“如果”“万一”。
例句：In case I forget, please remind me about it.万一我忘记，请提醒我一下。
5、条件状语从句的时态：当主句为将来时态或含有将来意义时，条件状语从句习惯上要用一般现在时表示将来意义，而不能直接使用将来时态。
if引导的条件状语从句总结(精)
if引导的条件状语从句总结(精)if引导的四种条件状语从句一、零条件句/绝对真实条件句(Zero Conditional)零条件句，又叫绝对真实条件句，用于阐述事实。
用来表达在该条件下，结果一定会如此(如规则，客观规律、真理等)。
结构是：If+主语+do/does，主语+do/does。
其从句和主句的谓语动词通常为一般现在时。
二、第一条件句/相对真实条件句(First Conditional)第一条件句又叫相对真实条件句，谈论将来可能发生的事情，并考虑这件事情的结果。
强调偶然性或一次性的条件，也可以与绝对真实条件句同义。
if从句用一般现在时或其他现在时，表示将来可能发生的事情(条件);主句用一般将来时，表示这件事情的结果。
结构是：If+主语+do/does，主语+will do。
三、第二条件句/现在虚拟条件句(Second Conditional)第二条件句是虚拟条件句的一种，即现在虚拟条件句(Unreal Present)，用来表达在现在或将来时间下不太可能或不可能发生的条件，这种条件句还可以用来表示试探性的、委婉的语气(可以理解为不大有自信，所以不太真实的条件)。
结构是：①与将来事实相反的非真实条件句是If+主语+should do/were to do/did，主语+would/should/could/might do;②与现在事实相反的非真实条件句是If+主语+did，主语+would/should/could/might+do。
四、第三条件句/过去虚拟条件句(Third Conditional) 第三条件句是表示与过去事实相反的虚拟语气，是用来表达如果(If)当时那样发生，另外一方面(当时)结果会如何。
通常是指过去的事情，带有一切已经太迟而不能够补救的意思。
结构是：If+主语+had done，主语+would/should/could/ might+have done。
if 条件句的时态搭配1.if从句用一般现在时，主句用一般将来时2.if从句用一般现在时，主句用may/might/canIf the fog gets thicker the plane may/might be diverted.3.if从句用一般现在时，主句用must/shouldIf you want to lose weight you must/should eat less bread.4.if从句用一般现在时，主句用一般现在时5.if从句用现在进行时，主句用一般将来时6.if从句用现在完成时，主句用一般将来时If you have finished dinner I’ll ask the waiter for the bill.。
if引导的条件句
tired
A:What will you do if you are tired? B: I will… if I am tired.
go to bed/have a rest/listen to music...
Discuss with your partner:
What will you do if you have a lot of money one day?
What’s the rule? （3）
if条件状语从句中，如果主句 是祈使句，从句用一般现在时。
•Let me know if he comes. •Don’t wait for me if I am late. •Put up your hands if you have any questions.
What’s the rule? （2）
if条件状语从句中，如果主句 有must，can，may等情态动 词，从句用一般现在时。
•You must stop if the traffic light is red. •You may go fishing if you are free.
•He can go home if he finishes his homework.
Find the rule (2)
I will take part in the English competition.
Find the rule (2)
Dad will buy a pen for me.
Dad will buy a pen for me. I will take part in the English competition.
What’s the rule? （1）
用if引导的条件状语从句15个
用if引导的条件状语从句15个如果引导的条件状语从句是英语语法中非常常见的句型，用于表达某种条件下发生的情况。
下面将介绍15个以if引导的条件状语从句的相关内容。
1. **Zero Conditional**Zero conditional用于表达普遍真理或习惯性的动作，结构为if + 现在时，现在时。
例如：If you heat water to 100 degrees, it boils.2. **First Conditional**First conditional用于表达将来可能发生的事情，结构为if + 现在时，将来时。
例如：If it rains tomorrow, we will stay indoors.3. **Second Conditional**Second conditional用于表达与现在事实相反的假设，结构为if + 过去时，would/could/might + 原形动词。
例如：If I were rich, I would travel around the world.4. **Third Conditional**Third conditional用于表达与过去事实相反的假设，结构为if + 过去完成时，would/could/might + have + 过去分词。
例如：If I had studied harder, I would have passed the exam.5. **Mixed Conditional**Mixed conditional结合了第二和第三条件句的结构，用于表达过去的假设对现在的影响，或现在的假设对过去的影响。
例如：If I had known you were coming, I would have baked a cake.6. **Unless**Unless的意思是“除非”，引导的条件状语从句表示否定条件。
结构为unless + 句子，相当于if not。
if的知识点
if的知识点【if条件句】分为两类：1.真实条件句（初二内容）2.虚拟语气（高二内容）✅本节内容if 条件句➡️真实条件句（条件状语从句）➡️虚拟语气（一种假设）➡️与现在事实相反➡️与过去事实相反➡️与将来事实相反if条件句一、认识if【if】:conj.连词“如果”，“假若”，“倘若”，“是否”，“即使”，“虽然”【if】一、真实条件句例：If it doesn't rain tomorrow， we will go hiking.如果明天不下雨，我们将去远足。
➡️“条件”是指从句中的动作实现后，主句中的动作才能发生➡️条件状语从句中，引导词if所在的句子是从句，另一部分为主句➡️if从句既可放在主句前，也可放在主句后。
若if从句放在主句前，须用逗号隔开。
在真实条件句里，从句永远只用【一般现在时】1.主将从现原则2.主情从现原则3.主祈从现原则✅1.主将从现主句是一般将来时，从句用一般现在时。
➡️If I don't call you tomorrow morning, I won't go to the party. 如果我明天早上没有给你打电话，我将不去参加聚会。
➡️ If you don't go to the party， neither will I.如果你不去聚会，那我也不去。
【neither+be动词/情态动词/助动词+主语，表示前者否定的情况，后者也适用，句子必须完全倒装】✅2.主情从现主句含有情态动词can/may/might/must/should等，从句用一般现在时。
➡️If you get up early, you can catch the first bus.如果你起得早，你就能赶上第一班公交车。
➡️If you don't want to be criticized, you should complete your homework carefully.如果你不想被批评,你就应该认真完成作业。
if引导虚拟语气条件句PPT课件
06
总结与回顾
回顾if引导虚拟语气条件句的用法
虚拟语气在条件句中的用法
在条件句中，使用虚拟语气表示与实际情况相反的情况，或者表 示假设、猜测等。
虚拟语气的形式
虚拟语气有多种形式，包括与现在事实相反、与过去事实相反、与 将来事实相反等。
虚拟语气的时态
虚拟语气与时态有关，需要根据实际情况选择适当的时态。
况，主句用would+have+过 去分词的形式。
翻译题
01
02
03
中文
如果我知道这个消息，我 早就告诉你了。
英文
If I had known the news, I would have told you long ago.
解释
从句表示与过去事实相反 的情况，主句用 would+have+过去分词 的形式。
题目
If he _______ the money, he _______ able to buy a car.
had had; would be
答案
解释
从句表示与过去事实相反的情况，主句用would+______ rained last night,
the ground would be wet this morning.
表示与事实相反的情况
总结词
与事实相反的情况是指条件句中的假设与现实情况相 反，主句使用虚拟语气表示与实际情况的差异。
详细描述
在英语中，当if引导的条件句表示与事实相反的情况时， 主句通常使用虚拟语气。这种用法常用于表示某种假设 的情况并未实现，而是与现实情况相反。例如，“If I were you, I would not make that mistake again.” （如果我是你，我不会再犯那个错误了。）这句话表示 的是假设自己是对方，但实际上并不是，提醒对方不要 犯同样的错误。
人教版中考英语语法知识点If+引导的条件句+练习
语法专题：条件状语从句（1）if条件句：有可能性结果发生的行动，在这些句子中，动词的时态是不同的，if 引导的条件状语从句中，主句用一般将来时态，从句用一般现在时态（主将从现）If it doesn’t rain（从句）, we’ll have a picnic tomorrow（主句）.We’ll have a picnic tomorrow, if it doesn’t rain.（if引导的从句可置前可置后）（2）主祈从现（祈使句+if+一般现在时态）Put up your hands if you have any questions to ask. 如果你们有问题问的话，请举手。
当主语是you时，if 引导的条件状语从句可以与”祈使句+and/ or +简单句”进行句型转换。
And 表示句意顺承，or 表示转折，意为”否则”。
Take care , or you will fall off the tree. = If you don’t take care, you’ll fall off the tree. 小心，否则你会从树上掉下来。
（3）主情从现（情态动词+if +一般现在时态）If I get there early, I can see the doctor quickly.（4）句型：will do式be going to do式肯定从句If主语+动词+其他, 主语+will(won’t) do+其他. If主语+动词+其他, 主语+be(be not) going to do+其他.否定从句If主语+be+not+其他, 主语+will(won’t) do+其他. If主语+be+not+其他, 主语+be(be not) going to do+其他.If主语+don't/ doesn't +动词原形+其他, 主语+will(won’t) do+其他. If主语+don't/ doesn't +动词原形+其他, 主语+be(be not) going to do+其他.If the picture is silly, strange and colourful, you will remember it better.If I have time, I am going to visite you .I will go to the park if it doesn’t rain tomorrow . I won't go to the park if it rains tomorrow.专题精讲实战演练题型1：单项选择( ) 1. If the robot ___________ wrong，you can get a new one for free or get all your money back.A. wentB. goesC. would goD. will go ( ) 2. —We’ll go for a picnic if it ___________ on Sunday.—Wish you a lovely weekend.A. rainB. doesn’t rainC. won’t rainD. rains ( ) 3. I’ll do it better if the teacher ___________ me another chance.A. giveB. givesC. gaveD. will give( ) 4. If a polar bear ___________, it ___________ fish from the waterA. will be hungry；catchesB. is hungry；will catchB. is going to be hungry；catches D. is hungry；won’t catch( ) 5. If our government ___________ attention to controlling food safety now, our health ___________ in danger.A. won’t pay; isB. doesn’t pay; isC. won’t pay; will beD. doesn’t pay; will be( ) 6. We will go for a picnic if it___________ tomorrow.A. doesn’t rainB. wasn’t rainyC. won’t rainD. wasn’t raining( ) 7. If the pure water is heated to 100 centigrade degrees, it___________ boil.A. is going toB. willC. wouldD. is to ( ) 8. She will go to America___________ she has much free time and money.A. as long asB. butC. thoughD. although( ) 9. We will go to the West Lake___________ it doesn’t rain heavily tomorrow.A. ifB. unlessC. as long asD. once ( ) 10. I won’t call you, ___________ something unexpected happens.A. unlessB. whetherC. becauseD. While Keys: 1-5 BBBBD 6-10ABAAA题型2：以所给词的正确形式填空1. If he ________ (study) hard, he will get good grades.2. Everyone must wear uniforms. If you don't, they ___________ (let) you in.3. If you stand at the top of the mountain, you _________ (see) the view of the whole city.4. My grandfather will wear a pair of glasses if he__________ (read) newspapers.5. Please turn off the light if you ________ (leave) the classroom.6. We’ll go for a picnic unless it ________(rain) this Sunday.7. Mr Smith ________ (let) you know if he needs help.8. If you walk along the street, you ________ (see) many foreigners.9. If Mary ________ (ask) me for help，I will try my best to help her.10. I don't know if it will snow tomorrow. If it_______ (snow)，we'll make snowmen. Keys:1. Studies 2.won’t let 3. will see 4. reads 5.leave6.doesn’t rain7.will let8.will see9. asks 10.snows直击中考题型1：单项选择( ) 1.—I wonder if your wife ________ to the party.—If your wife _________, so will mine.A. will go, goB. will go, goesC. goes, will goD. will go, will go ( ) 2. If he _________ in half an hour, we _________ wait for him.A. won't come, won'tB. won't come, don'tC. doesn't come, won'tD. will come, don't ( ) 3. I will send you an e-mail as soon as I_________ in Canada.A. arriveB. arrivedC. am arrivingD. will arrive( ) 4. If there ________ no buying and selling of animals, there _________ no killing in nature.A. is; will beB. will be; will beC. is; isD. will be; is ( ) 5. You can’t watch TV ________ you finish your homework.A. beforeB. ifC. whileD. asKeys:1-5:ACAAA。
总结好的：IF引导的条件状语从句
if引导的条件状语从句if条件句：条件句用于陈述语气，表示假设的情况可能发生，其中if 是“构 成条件从句主 句时 态If＋一般现在时主语＋shall/will+动词原形例 句If he comes,he will take us to the zoo.1)用法：(1)条件状语从句通常由连词if引导，意为“如果、假如”，主句不能用be going to表示将来，而应该用shall，will。
If you leave now, you are never going to regret it. (错误) If you leave now, you will never regret it. (正确)(2)if “如果”，引导条件状语从句，主句用一般将来时，从句则用一般现在时，如： If it rains tomorrow, I shan’t climb the hills.(3)另外，主句是祈使句或含有情态动词，从句也用一般现在时。
如：Please call me if he comes next Sunday.Can you call the policeman if you are in the trouble.注意宾语从句中的if与条件状语从句if的区别。
宾语从句中的if“是否”相当于whether，引导宾语从句，时态需根据语境确定。
如果主句用一般现在时，从句可以根据具体情况选用时态，如果主句用一般过去时，从句必须用过去式的某种形式。
I don't know if it will rain tomorrow. 我不知道明天是否会下雨。
Our teacher said there was going to be a football match the next month.我们说下月将有场足球比赛。
【边学边做】用括号内所给词的正确形式填空。
1. What will you buy if you ________（have）a lot of money?2. If it ________（not snow）tomorrow, we will feel unhappy.3. You mustn’t go to school if you ________（be）still in bed.4. If he _______（be）at home at that time, he would know it.5. Please show me the way if you ________（know）it.6. You will hurt your teeth if you ________（eat）too much candy.7. If you gave me a toy car, I _________（be）very happy.8. I would get the prize if I _________（work）hard.9．If she ______ (finish ) work early ,she ______(go) home.10．If the weather______（be）fine，we_______(go)for a walk .11. If I_____(have) time tonight ,I _______(finish) the book I’m reading.12. If it ______(rain) next weekend , we_______(not be able to ) plant the vegetable .13. If it_______(rain),we______(stay) at home .14.If she______(arrive) ,she _____(phone) me .15. If he_____(call),tell him I’ll ring back .二、用所给词的适当形式填空1. If you ________(feel) tired, you _________ (have) to have a rest.2. Where _____ he ____(see) the film if he _________(have) time?3. If there ____ (be) fewer trees, there _______ (be) more pollution.4. He ___ (dress) more casually if he ___ (not work) on weekends.5. If Marcia _______ (live) alone, she _______ (keep) a pet parrot.6. Lana _____ (buy) a new dress if the old one ____ (be) out of style.7. The twins _______ (fight) if they__________ (argue).8. I ______ (have) a bake sale if I ____ (need) money for education.9. Peter ____ (send) me a beautiful souvenir if he ____(tour) Spain.10. If Mr. Green _______ (say) I am hard- working, my parents ___ (feel) glad.11. I ______ (go) to the beach if it________ (not rain) this week.12. _____they ___ (have) a match if the P.E. teacher __ (be) busy?13. He ____ (write) a letter to his grandparents if he ____ (get) his report card this week.14. If she ______ (get) up late, she _____ (not catch) the early bus.15. Peter ____ (major) in English if he ____(pass) the exams in PekingUniversity.二、完成句子1. 他如果看电视太久了，他的父母会不高兴。
if的条件句的三种用法
千里之行，始于足下。
if的条件句的三种用法条件句在英语中是非经常见的一种句型，用于表达假设、可能性和条件关系。
if（假如）是条件句的引导词，它可以有不同的用法和用途。
下面将具体介绍if条件句的三种常见用法。
1. 条件虚拟语气条件虚拟语气用于表示假设、与事实相反的状况或不行能的状况。
它包括三种类型：与现在事实相反、与过去事实相反和与将来事实相反。
与现在事实相反：这种类型的条件句用于描述与现实状况相反或与过去和现在的条件不全都的状况。
它的结构是：“if + 过去完成时，主语 + would/could/might + 动词原形”。
例如：- If I had studied harder, I would have passed the exam.（假如我学习更努力点，我就会通过考试了。
）- If she had told me earlier, I could have helped her.（假如她早点告知我，我原来可以挂念她的。
）与过去事实相反：这种类型的条件句用于描述与过去事实相反的状况。
它的结构是：“if + 过去完成时，主语 + would/could/might + have + 过去分词”。
例如：- If I had known he was sick, I would have visited him.（假如我知道他病了，我原来会去探望他的。
）第1页/共3页锲而不舍，金石可镂。
- If the weather had been better, we might have gone to the beach.（假如天气好些的话，我们或许会去海滩的。
）与将来事实相反：这种类型的条件句用于描述与将来事实相反的状况。
它的结构是：“if + 过去完成时，主语 + would/could/might + 动词原形”。
例如：- If I had more money, I would travel around the world.（假如我有更多的钱，我就会周游世界。
if引导的条件句三种情况
1•对现在虚拟：条件句：一般过去时主句：could/would/+动词原形。
2•对过去虚拟：条件句：过去完成时主句：could/would have done0 3•对将来虚拟:条件句：l.were to do ;2.should do ; 3•—般过去时：主句could/would/+动词原形。
—、对现在情况的虚拟条件从句中谓语动词用一般过去式,主句用,f would/should/might/could+动词原形”形式,表示对现在不可能实现情况的假想。
If I were you,I would choose to work in a small town.如果我是你f我会选择在小城镇工作。
（事实上我不是你）If I had a map now,we could easily get out of the forest.如果现在有地图，我们能很容易地走出森林。
（事实上是现在没有地图）注意：在条件从句中，如果谓语动词是be的形式，不管主语是单数还是复数，书面语中用we©而口语中如果是单数,也可以用was,不过在if I were…中一般用were.If the world were perfect,how could we enjoy the pleasure and comfort of being successful?世界若完美,我们如何能尝到创造成功的快慰?二、对过去情况的虚拟条件从句中谓语动词用过去完成式,主语用,/would/could/should/might+have+动词的过去分词"形式。
If it had not been for your help yesterday^ could not have caught the bus.如］果昨天没有你的帮助，我不会赶上公交车。
（事实是你昨天已经帮助了我，所以我赶上了车）三、对将来情况的虚拟在表示与将来事实相反的条件从句中,谓语动词可用should do,were to do或动词的过去式三种形式表示，但意义略有不同。
If条件句
3.与过去事实相反的虚拟条件句 构成 条件状语从句 主句
If + 主语 + 动词过去完成 主语+ would, should, could, might+ have + 式 过去分词
例如 If there had been no air in the tube, the result would have been better.
某英文网站正在开展关于“高一是否该分文理科”的讨论。 请你根据下面所给的要点提示，用英语写一篇短文， 描述目前存在的两种看法，并陈述你的观点，以便向该网 站投稿。 赞成分科的人认为1. 可集中精力学习；2. 减轻学习压力； 3. 学自己喜欢的学科。 反对分科的人认为1. 学科知识受限制；2. 影响个人素质提 高； 3. 对科目缺乏深入了解。你的观点…… 注意：1．词数：120词左右； 2．参考词汇： 素质：quality n. 分科：division n. 全面的：all-round adj. 3. 短文的开头已给出，不计入词数。
I.虚拟语气用在条件状语从句中 虚拟语气用在条件状语从句中，通常从句由连词if 引导。 1.与现在事实相反的虚拟条件句 条件状语从句 If +主语 +动词过去 式(be的过去式用 were) 主句 主语+ would, should, could, might+动词原形
例 If I feared death, I wouldn’t be a Party member. 怕死就不做共产党员。 If there were no air, we couldn’t live. 如果没有空气，我们就不能生活。
if 引导的条件句 if引导的条件句表示在某种条件下，会导致另 一事发生。句式为if从句+ 主句。 中文意思是“如果某事发生（或不发生）， 另一事就（不）发生”。通常分以下两种情形： 一、真实条件句 二、虚拟条件句
if引导的条件状语从句的用法
（3）假设
真的，或者有可能成为真的；
（二）假设将来，假设的条
将来
件是将来可能实现的。
1. if 非真实条件句（虚拟）——假设现在
（二）遵循的原则
should do
might+do
例 7 If I _____(be) a bird,I would fly to you right
状态，是正在玩球的意思，
所以此空填 is playing。
3. if 引导的真实条件状语从句——假设将来
例 3 If it _____(rain) tomorrow,we will stay at home.
解析：如果你不想受伤，
就不要玩刀。根据 Don’
t
play with the knife,主句是祈使句，所以从句为 if 引导
to the park.
he will take me to the park,主句用的一般将来时，而且
可以分析出，他哥哥现在还没有回，所以从句为 if 引
导的表将来的条件状语从句。根据“主将从现”的原
则，此空填 comes。
2. if 非真实条件句（虚拟）——假设过去
例8
Years ago if someone_____ (turn) round to
批改学生作文时，遇到拼写错误较多的学生可以这样
及各个时代相关代表作品的赏析，感受中西方文化的
评价：
不同，提高其审美水平；在进行人教版（2014）高中英
neat and tidy！
学生参观学校的科学实验室或者本地的科技馆，感受
1. 认 同 欣 赏:I like your handwriting，which is so
if从句的三种用法
千里之行，始于足下。
if从句的三种用法if从句是英语语法中常见的一个句子结构，用于表示假设、条件或可能性。
依据具体的语境和意义，if从句有三种常见的用法：条件句、假设句和虚拟语气句。
下面将具体介绍这三种用法。
一、条件句（Conditional Sentences）条件句用于表示某种条件下的结果或后果。
它由if引导，分为三种类型：零条件句、一般条件句和虚拟条件句。
1. 零条件句（Zero Conditional Sentences）零条件句表示事实真实的条件和结果，表示的是普遍真理或状况。
它的结构通常是：if + 现在时，现在时。
例如：- If you heat ice, it melts.（假如加热冰，它会溶化。
）- If it rains, the ground gets wet.（假如下雨，地面会变湿。
）2. 一般条件句（First Conditional Sentences）一般条件句表示可能发生的条件和结果，表示的是将来可能发生的状况。
它的结构通常是：if + 现在时，将来时。
例如：- If it rains, I will stay at home.（假如下雨，我会呆在家里。
）3. 虚拟条件句（Second Conditional Sentences）虚拟条件句表示不太可能实现的条件和结果，表示的是与现实相反的状况。
它的结构通常是：if + 过去时，would + 动词原形。
第1页/共3页锲而不舍，金石可镂。
例如：- If I had a lot of money, I would travel around the world.（假如我有很多钱，我会环游世界。
）二、假设句（Suppositional Sentences）假设句用于表示假设、猜想或非真实状况。
它由if引导，通常是对将来可能的状况进行推想或假设。
1. 假如假设是可能的（Possible Condition）这种状况下，if从句和主句中的动词形式一般都使用现在时。
if来引导的句子
"if" 是英语中的一个条件状语从句的引导词，它通常用来表示某个条件下的结果或假设。
以下是一些使用 "if" 引导的句子示例： 1. "If you study hard, you will pass the exam." (如果你努力学习，你会通过考试。
)
2. "If it rains tomorrow, we will stay at home." (如果明天下雨，我们会呆在家里。
)
3. "If the car breaks down, we will have to walk." (如果车坏了，我们只能走路。
)
4. "If I had more time, I would finish the project." (如果我有更多的时间，我会完成这个项目。
)
5. "If you want to succeed, you must work hard." (如果你想成功，你必须努力工作。
)
请注意，"if" 引导的从句通常放在主句之后，并且使用逗号与主句分隔。
例如：
"I will go to the party if my friend is going too." (如果我的朋友也去，我会去参加派对。
)。
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课程名称高一英语上课时间年月日课时第课时辅导师学生辅导方式一对一教学内容 If 引导的条件状语从句教学材料教学目标掌握If 引导的条件状语从句教学重难点主、从句的时态教学过程设计Step 1 复习默写短文。
_________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ _________________________________________________________________________________________________ 听写单词、不规则动词的过去分词。
_____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________Step 2 短文学习If you park your car in the wrong place, a traffic policeman will soon find it. You will be very lucky if he lets you go without a ticket. However, this does not always happen. Traffic police are sometimes very polite. During a holiday in Fr ance, I found this not on my car:‗sir, we welcome you to our city. This is a ―No parking‖ area. You will enjoy your stay here if you pay attention to the street signs. This note is only a reminder.‘ If you receive a request like this you cannot f ail to obey it!语言点☆park v.停放（汽车）parking area 停车场☆traffic n.交通traffic police 交通警traffic lights 交通灯(in) traffic jam 交通堵塞(in) heavy traffic 交通拥挤☆not n.便条；纸钞make notes 做笔记☆reminder n.提示remind v.指示；提醒remind sb of sth remind sb to do sth★fail v.失败fail to do 没有能够做某事He fail to swim across the river.not fail to do sth 一定能做某事I can not fail to pass it. 我一定会通过的。
You can not fail to obey it. 你一定会遵守。
☆in the wrong placewrong 不合适的right 合适的He is the wrong / right person who you are looking for .Step 3 if引导的条件状语从句注意if 条件句的时态搭配if从句用一般现在时，主句用一般将来时If he runs，he‘ll get there in time.If it rains tomorrow, I will stay at home.If it doesn‘t rain tomorrow, I will go to the zoo with my c lassmates.I will go shopping on Saturday if you go.if 条件状语从句的时态练习一．在正确的答案下划一条线。
1.Daina ( will go / go /goes) to Europe if she (will pass / pass / passes) the exams .2. Where (will / do /does) they live if they (will miss / miss / misses) the bus?3. If there (will be / are / is) a car accident, they (will call /call /calls) 110 for help at once.4. If it (won‘t /don‘t / doesn‘t / isn‘t) rainy, we (will take / take / takes) walk outside.6. If he (will have /have / has) money, he (will bulid /build / builds) a science lab.7.Don‘t wait for me if I (am / will be) late.8.They (won‘t / don‘t) go to the beach if it (will rain /rain / rains).9. I (will call / call) you if he (will stay /stay / stays) at home.10. (Will / Do/ Does) he visit the mus eum if he (won‘t / don‘t/ doesn‘t) get tired?二、用所给词的适当形式填空1.If you ________(feel) tired, you _______________ (have) to have a rest.2. Where _______ he _________(see) the film if he ________________(have) time?3. If there __________(be) fewer trees, there _______________( be) more pollution.4. He _____________(dress) more casually if he ________________( not work) on weekends.5. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot.6. Lana ________________( buy) a new dress if the old one ____________(be) out of style.7.The twins ______________(fight) if they_______________(argue).8. I ____________(have) a bake sale if I _____________(need) money for education.9. Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain.10. If Mr Green ___________(say) I am hard- working, my parents _________( feel) glad.单项选择1.If you _____ to the party, you‘ll have a great time.A. will goB. wentC. goD. going2. It will be a long time ____ Peter _____ his work.A. since, has finishedB. after, finishesC. when, will finishD. before, finishes.3. What will father _____ us from Japan?A. takeB. bringC. carryD. make4. Weifang is famous ______ kites.A. forB. toC. onD. with5．I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks6. – What are you going to do tomorrow? --We‘ll go to the library tomorrow if it ___.A. isn‘t rainB. rainC. won‘t rainD. doesn‘t rain7.—Do you know when he will come back tomorrow?--Sorry, I don‘t know. When he ____ back, I‘ll tell you.A. comesB. will comeC. comeD. may come8. What will you do if you _____ to the old folk‘s home visit?A. goB. wentC.goingD. will go9. If I eat ____ food, I‘ll be very fat.A. too manyB. many tooC. too muchD. much too10. I‘ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came11. There ____an English film in our school tomorrow.A. is going to haveB. will haveC. is going to beD. has12. Could you tell us where ____？A. will the next Olympic Games heldB. the next Olympic Games will be heldC. would the next Olympic Games be heldD. the next Olympic Games would be held13. When my mother returned last night, I ____ a book.A. readB. am readingC. was readingD. am going to read14.What ____ you ____ when it began to rain?A. do, doB. were, doingC. are, doingD. did, do15. I‘ll wake you up when he ____back.A. willB. is going to comeC. comesD. come注意与if引导的宾语从句区分Step 4 完形填空We were going to play a team from a country school.They didn't come until the game time arrived. They looked ____ 1 ____ than we had thought.They were wearing dirty blue jeans (仔裤) and looked like farm boys. We even thought that they had never seen a basketball before. We all sat down. We felt that we didn't ____ 2 ____ any practice (训练) against a team like that. It was already so late that no ____ 3 ____ could be given to them for a warm up. The game began. One of our boys ____ 4 ____ the ball and he shot (掷) a long pass to our forward (前锋). From out of nowhere a boy in a dirty T shirt ____ 5____ the pass and with a beautiful form (姿势) he shot and got two points (分). They ____ 6 ____ us.Then they got another ____ 7____ of points in a minute. Soon it was all over. The country team ____ 8____ us. We certainly learned that even though a team is good，there is usually another ____ 9 ____ a little better. But the important lesson learned was: One can't tell a man，or a team，by the ____10 ____ .1 A stronger B younger C worse D less2 A get B try C use D need3 A basket B space C ball D time4 A got B played C missed D carried5 A caught B changed C started D stopped6 A surprised B kept C broke D hit7 A half B pair C group D double8 A won B saved C beat D joined9 A just B already C about D almost10 A T shirts B clothes C places D points［答案］1 C 2 D 3 D 4 A 5 D 6 A 7 B 8 C 9 A 10 BStep 5 homework1、默写短文2、记动词的过去式和过去分词。