if条件状语从句

if条件状语从句一:if引导条件状语从句的用法“主将从现”和表事实时用现在时零碎用法" if " 引导的条件状语从句的用法,现在总结一下: if 条件句不一般,几个要点记心间; 条件句,放在前,逗号要放句中间。条件句表可能，主句多用将来时；条件句表事实，主句常用现在时。在if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。如：We can walk there if we can"t find a bus . If it rains tomorrow , we will not go to the zoo. What will you do if you find a panda in danger. 如果if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从句大多用一般现在时态。如：If bears are in danger ,they attack people. 注意：在if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若if 条件句放句首，从句后面要加逗号，和主句隔开。还要注意前后时态一致原则我们知道,引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如:If you ask him, he will help you.如果你请他帮忙,他会帮你的。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。另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如: If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。

I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。那么,除了if之外,是否还有其他连词也可以引导条件

状语从句呢?回答是肯定的,不仅有,还有很多。这些词由于出现的频率较小,且用法较复杂一些,所以不如if为大家所熟知罢了。下面就这些词的用法以例句的形式进行一下简单总结。 1. unless conj.除非,若不,除非在……的时候You will fail to arrive there in time unless you start earlier.如果你不早点动身,你就不能及时赶到那儿。Unless it rains, the game will be played.除非下雨,比赛将照常进行。

2. on condition(that)...在……条件下,如果on condition (that)...引导的条件从句是主句事件发生的前提条件或唯一条件。I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相,条件是你答应保守秘密。You can go swimming on condition (that) you don"t go too far from the river bank.你只有在不远离河岸的条件下才可以下水游泳。

3. supposing conj.如果,假如supposing引导的条件从句表示一种假设条件。Supposing it rains, shall we continue the sports meeting?倘若下雨,我们的运动会还要继续举行吗? Supposing something should go wrong, what would you do then?假如出了什么问题,你准备怎么对付?

4. provided conj.假如,除非,以……为条件provided (that) +从句表示一种假设条件。He will sign the contract provided we offer more favorable terms.如果我们提出更优惠的条件,他就会在合同上签字。He won"t be against us in the meeting provided that we ask for his advice in advance.如果我们提前征求一下他的意见,他就不会在会上反对我们。从上述例句可以看出if, unless, on condition (that), supposing, provided等词引导的条件状语从句,主从句条件关系分明,结构清晰。但有些句子,虽没有含条件关系的连词,却也隐含着条件关系,这些句子常用一些词,如but for, without等引出一个介词结构来表示

条件,条件常常是虚拟的,或与事实相反的假设。如:but for若非,要不是But for the rain, we should have a pleasant journey.要不是下雨,我们的旅行肯定会很愉快。But for your help,we should not have finished in time.要不是你帮忙,我们肯定不能及时完成任务。重点2 -if句上个学期，我们曾经学过由if 引导的句子，你还记得吗？对了，“ I’ll not go to the zoo if it rains tomorrow. ( 假如明天下雨，我就不去动物园。) You can come to the party if you don’t wear jeans.（如果你不穿牛仔裤，你就能来舞会。）” 这个学期又在本单元见到了似曾相识的同样由if引导的句子，比如：“If I won the lottery, I would give it to medical research. （假如我赢了彩票的话，我就捐给医学研究。）If I were you, I would wear jeans and T-shirt.（如果我是你，我就穿牛仔裤和T恤。）”这两个单元学到的句子都是由if引导的。那么，它们有什么区别呢？分两种情况：1．something may possible happen 某事发生的可能性较大。这种情况，有个十三字口诀：“主将从现，主过将从过，主现从现”。即主句是一般将来时，从句用一般现在时；主句用过去将来时，从句用一般过去时；当主句中有can/can’t的话，则从句用一般现在时。例如：If he has time, he will come tomorrow.If she finishes early, she can come back early.If you don’t do homework, the teacher will scold you.

if条件状语从句二:if引导的条件状语从句有何需要注意的事项？这个主要分一般性的if条件句和虚拟语气中的条件句。分别简单的给你讲述一下。（话说我最近回答了好多问题，收藏转发很多，为何点赞的不多呢？

If引导的条件状语从句

If引导的条件状语从句一、If引导的条件状语从句的结构 If+主语+谓语+其它,主语+谓语+其它.=主语+谓语+其它+if+主语+谓语+其它. 注：①有if 的是从句,另一个是主句 ② if 从句在前有逗号，if从句在后无逗号 eg.If he runs, he will arrive there in time .=He will arrive there in time if he runs . 如果他跑，她将会准时到达. 二、if条件句主句和从句的时态，if译为如果 1.主句用一般将来时（will+ V-原），if 从句用一般现在时（be用is/am /are , 实义动词用V-原/V-三单）, 即主将从现注：①当主语为I ,you, we, they ,复数名词，以及由and连接的两个并列成分等时，实义动词用V-原 ②当主语为he ,she ,it ,that ,单个人名，单数名词等时，用V-三单） eg .If it is (be) rainy , we will stay(stay) at home . If she studies (study ) hard , she will get (get) good grades . 2.若主句中含有情态动词(can/may/ must/may/might/should )时，主句为情态动词+ V-原，if从句用一般现在时 eg .We can will go(go) out if it stops (stop ) raining . eg.If you want (want) to get good grades ,you should study (study)hard. 3.若主句为肯定祈使句或否定祈使句时，if从句用一般现在时注：以V-原开头的句子是肯定祈使句，否定祈使句在V-原前加Don’t eg. Eat (eat) them if you are (be) hungry . eg. Don’t go (not go)to play football if she doesn’t finish (not finish)your homework .拓展:if 还可引导宾语从句，译为“是否” If 引导宾语从句时，时态需根据语境确定，如果主句是一般现在时，从句可以根据具体情况选用时态，如果主句是一般过去时，从句必须跟过去时相关 ( )1.----Mike wants to know if _________ a picnic tomorrow . ----- Yes . But if it _________ , We will visit the museum . A. will you have , will rain B. you will have , will rain C. you will have ,rains D. will you have , rain ( )2.We are not sure if it ____ tomorrow .If it ____ , our sports meeting will be put off . A. will rain , rains B. rains , will rain C. will rain ; will rain ( )3. ---Can you guess if Mike _______ swimming this afternoon ? ---I think he will go with us if he _______ fine . A. will go ,is B. will go ,will be C. goes , is D. goes ,will be 答案解析： 1.迈克想知道是否你们明天将去野营，if译为是否，引导宾语从句，时态根据语境而定，句末有tomorrow , 所以要用将来时。答句为是的，如果天下雨，我们将去参观博物馆，if译为如果，时态要遵循主将从现，答案选C 2.第一个if 译为是否，引导宾语从句，句末有tomorrow , 所以要用将来时，第二个if译为如果，时态要遵循主将从现，答案选A 3.第一个if 译为是否，引导宾语从句，句末有this afternoon , 所以要用将来时，第二个if译为如果，时态要遵循主将从现，答案选A

if条件状语从句

if条件状语从句 If 引导的条件状语从句 If 引导的条件状语从句表示“如果… , 假如…”，表示在某种条件下某事可能发生。含有if引导的条件状语从句的复合句由主句和从句构成。If引导的是完整的句子，一定要有主语，称为从句，另一个句子称为主句。句子结构：1. 祈使句/ 主句（will do ）/ 主句（can / must / should 等+do）+if条件状语从句 2. if条件状语从句, + 祈使句/ 主句（will do ）/ 主句（can / must / should 等+do） 1. Drop in on me if you have time . = If you have time , drop in on me . 2. I will help you do housework if I finish my homework earlier . = if I finish my homework earlier , I will help you do housework . 3. Y ou must study hard if you want to pass the exam . = If you want to pass the exam , you must study hard . 特别注意：（1）上述情况下，条件状语从句必须用一般现在时态表示将来动作。不可用一般将来时。（2）if条件句和”祈使句+and / or+简单句”句型的转换 Hurry up , or you’ll be late .= If you don’t h urry up, you will be late . Go straight ahead , and you will find the post office . = If you go straight ahead , you will find the post office . (3) unless 引导条件状语从句，可以和if转换。unless（如果不，除非）= if … not … I won’t go to her birthday party unless she invites me .

if 条件状语从句

if引导的条件状语从句引导条件状语从句最常用的连词是if，常见的if条件状语从句表示在某条件下，某事很可能发生，条件是可能存在的，主句中某种情况发生的概率也是很高的。如：一，第一类： 1）表示普遍真理和客观事实： If you heat ice ,it melts . If you pour oil on water,it floats. 不受时间限制的自然法则的条件句，主句，从句都是一般现在时。2）表示习惯性的动作 If I make a promise , I take it . If it rains ,I go to work by car. 表示一个现在习惯性的动作，主句和从句的谓语动词都是一般现在时。 3）表示过去的习惯性，经常的动作 If it rained,I went to work by car. If I was hungry, I usually had a full meal. 主句和从句谓语动词要依据时间来变为一般过去时。 questions and answers : What do you like to drink if you are very thirsty?

How many days are there in February it it is a leap year ? Who do people go and see if they get ill ? 第二类： If we catch the 10 o’clock train ,we shall (will ,can, may,must ,should ) get there in time . If it is fine tomorrow ,we can have a picnic somewhere. If you wake up before me , give me a call . 条件句（从句）用一般现在表示将来，主句用shall 加动词原型或者是祈使句在if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。 We can walk there if we can't find a bus . If it rains tomorrow ,we will not go to the zoo. What will you do if you find a panda in danger?

if 条件状语从句

If 引导的条件状语从句 If 引导的条件状语从句表示“如果… , 假如…”，表示在某种条件下某事可能发生。含有if引导的条件状语从句的复合句由主句和从句构成。If引导的是完整的句子，一定要有主语，称为从句，另一个句子称为主句。句子结构：1. 祈使句/ 主句（will do ）/ 主句（can / must / should 等+do）+if条件状语从句 2. if条件状语从句, + 祈使句/ 主句（will do ）/ 主句（can / must / should 等+do） 1. Drop in on me if you have time . = If you have time , drop in on me . 2. I will help you do housework if I finish my homework earlier . = if I finish my homework earlier , I will help you do housework . 3. Y ou must study hard if you want to pass the exam . = If you want to pass the exam , you must study hard . 特别注意：（1）上述情况下，条件状语从句必须用一般现在时态表示将来动作。不可用一般将来时。（2）if条件句和”祈使句+and / or+简单句”句型的转换 Hurry up , or you’ll be late .= If you don’t hurry up, you will be late . Go straight ahead , and you will find the post office . = If you go straight ahead , you will find the post office . (3) unless 引导条件状语从句，可以和if转换。unless（如果不，除非）= if … not … I won’t go to her birthday party unless she invites me . 专项练习： 1. ______ my watch if your watch ______ . A. Look at ; isn’t work B. Look at ; doesn’t work C. Look ; works D. Look ; doesn’t work 2. Please get up early _____ you want to catch the first bus . A. or B. because C. and D. if 3. ______ to lock the door if you _____ the last one to leave . A. Forget ; are B. Don’t forget ; will be C. Forget ; will be D. Don’t forget ; are 4. If you _____ to stay healthy , ____ some exercise every day . A. want ; do B. wants ; does C. will want ; do D. will want ; does 5. _____ your mother the truth , if you don’t like it .A. Tell B. To tell C. Telling D. Tells 6. If you have something important to tell us , _____ it right now ! A. speak B. talk C. tell D. say 7. If you ______ to the music , buy a CD . A. will listen B. listen C. listening D. listened 8. Be careful if you ______ want to make mistakes . A. won’t B. don’t C. didn’t D. not 9. If you ____ a chance to study in a foreign country , just take it .A. getting B. had got C. will get D. get 10. All of us will be happy _____ you can come with us . A, while B. if C. but D. or 11. If Mr. Smith ____back , please let me know . A. will come B. comes C. come D. had come 12. I am waiting for my friend. _______ , I’ll swim alone . A. If he doesn’t come B. If he won’t come C. If he will come D. If he is coming 13. I’ll go to the zoo if it _____ tomorrow .A. doesn’t rain B. will rain C. rains D. won’t come 14. If you___ another programme , ___ this button . A. choose ; press B. chose ; press C. chose ; to press D. choose ; pressing 15. Hurry up , _____ you’ll miss the last bus . A. or B. if C. so D. then 16. I won’t finish washing the dishes before 7:00 , ____ you _____ help me . A. unless ; / B. if ; don’t C. when ; / D. A or B 17. --- ______ if he leaves school this afternoon ? ---- The teacher will punish him .

if条件状语从句

if引导的条件状语从句一．概念:if引导的条件状语从句属。从句表示主句动作发生的，从句可以放在之前，也可以放在主句之后。二．分类：，，。三．用法 1.主句用一般将来时，从句则用一般现在时。可以概括为“主将从现”。 (1).将下面的两个简单句合并为一个复合句一条件状语从句。 ①The weather will be sunny tomorrow. We will have a picnic. . ② She will get good grades next time. Her mother will be happy. . ③ We will be free tomorrow. We will go on a school trip. . ④They will be free this Friday. They will play basketball with their friends. . ⑤It won't rain the day after tomorrow. We ll go hiking. . ⑥He won't watch TV tonight. He will finish his homework. . (2)用所给词的适当形式完成下列句子. ①If the weather (be) fine tomorrow, we will take a walk in the park. ②If she (arrive) next Sunday, will you meet her at the airport? ③ My mother (not be) happy if i play games for too long. ④ If it ( rain) tomorrow, what will you do at home? ⑤If it rains tomorrow, we (go) fishing. ⑥I'm waiting for my friend now, if she (not come), I will go shopping alone. ⑦ If Nick (get) home too late, he (miss) his favorite cartoon. ⑧ If Tom's mother (go) out this weekend, Tom will look after his younger sister.

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+do e.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。 Had we not used an out-of-date timetable, we wouldn't have missed the train. if引导从句的倒装从句相当于 if we had not used an out-of-date timetable, 同样，were还有should 在从句中都可以提前，省略if.

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

if引导的条件状语从句

If 引导的条件状语从句遵循主过从过、主将从现的原则。主将从现（主情从现、主祈从现） If it rains tomorrow,I won’t climb the hills. If it doesn’t rain tomorrow,I will go to the countryside with my friends. If 引导的条件状语从句 If 引导的条件状语从句遵循主过从过、主将从现的原则。主将从现（主情从现、主祈从现） If you will help me,I'll finish it on time. We may go out if it's fine tomorrow. If you finish your homework,you can watch TV. Please call me if you go shopping next Sunday. If I go there，I'll take her some flowers. We'll stay at home if it rains tomorrow. Please call me if he’s at home. If you work harder,you’ll pass the exam. She will visit her grandpa if she has time tomorrow. We’ll take a taxi to the city if the train doesn’t arrive on time. The teacher will be angry if he is late. If引导的条件状语从句与unless引导的条件状语从句的转换 If+否定形式=unless+肯定形式

if引导的条件状语从句

if引导的条件状语从句 if引导的条件状语从句是中考中常考的知识点，我们一起来学习一下它的具体用法吧！一、连接词if if是引导条件状语从句的连接词，表示主句中动作发生的条件。还是看看具体例子吧！ If you get up early, you will catch the bus. 如果你早起的话，就能赶上那班公共汽车。 You must see the doctor if you are ill. 如果你生病了，就必须去看医生。二、if引导的条件状语从句的构成构成方式为：“主句+if引导的条件状语从句”或“if引导的条件状语从句+主句”。在含有条件状语从句的复合句中，如主句在前，从句在后，主从句之间不用标点；如要强调从句的内容，则把从句放在主句的前面，这时主从句之间要用逗号隔开。例如： I will go to his birthday party if he invites me. =If he invites me, I will go to his birthday party. 三、if引导的条件状语从句的时态在一般情况下，如果主句谓语动词表示将来的意义，从句谓语动词用一般现在时表将来。常见的有以下几种： 1. 主句是一般将来时。例如： You will be late for school if you get up late. 如果你起晚了，上学将会迟到。 If it rains tomorrow, we won't go to the Great Wall.

如果明天下雨，我们就不去长城。 2. 主句的谓语动词是want, hope, wish等词。例如： I hope to visit her if I'm free. 如果我有空，我希望去拜访她。 3. 主句的谓语动词含can, may, must等情态动词。例如： If I finish my homework, I can watch TV. 如果我完成了家庭作业，就可以看电视。 4. 主句是祈使句。例如： Don't forget to lock the door if you are the last one to leave. 如果你最后一个离开，别忘了锁门。【跟踪训练】一、用所给动词的适当形式填空。 1. If I run every day, I （be） healthier. 2. If you （not eat）healthily, your body won't be well. 3. If you sleep well, you （feel） better. 4. If you （relax）， you'll sleep better. 二、选择填空。 1. We won't wait for you _________ you can't come here on time. A. if B. unless C. when D. until 2. If he _________ harder, he will catch up with us soon. A. study B. studies C. will study D. studied

if条件状语从句

if条件状语从句 if条件状语从句一:if引导条件状语从句的用法“主将从现”和表事实时用现在时零碎用法" if " 引导的条件状语从句的用法,现在总结一下: if 条件句不一般,几个要点记心间; 条件句,放在前,逗号要放句中间。条件句表可能，主句多用将来时；条件句表事实，主句常用现在时。在if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。如：We can walk there if we can"t find a bus . If it rains tomorrow , we will not go to the zoo. What will you do if you find a panda in danger. 如果if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从句大多用一般现在时态。如：If bears are in danger ,they attack people. 注意：在if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若if 条件句放句首，从句后面要加逗号，和主句隔开。还要注意前后时态一致原则我们知道,引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如:If you ask him, he will help you.如果你请他帮忙,他会帮你的。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。另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如: If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。那么,除了if之外,是否还有其他连词也可以引导条件

if_条件状语从句

If引导的条件状语从句（1）①“if 从句＋祈使句”②“祈使句＋if 从句”。 If you need help，please call me.如果你需要帮助，请给我打电话。 Have a good rest if you are tired. 如果你累了，就好好休息一会儿吧。（2）主语+情态动词+动词原形+…，+ if 从句。We can walk there if we can't find a bus . You can pass the exam if you work hard. （3）If表示“如果”、“假如”引导条件状语从句。主句常用一般将来时态，从句用一般现在时态。如： If it rains tomorrow ,we will not go to the zoo. We will go out for a picnic if it is sunny tomorrow.如果明天阳光明媚，我们就外出野餐。（4）条件状语从句有时可以表达为“祈使句+and / or+简单句”。其中and表示句意顺承；or则表示转折，意为“否则”。例如： If you work harder, you’ll pass the exam. = Work harder, and you’ll pass the exam. If you don’t hurry up, you’ll miss the train. = Hurry up, or you’ll miss the train. 备注：时态呼应即主句用现在时，从句也用现在时；主句用过去时，从句也用过去的某种时态。（1）主句是一般现在时(包括祈使句和含有情态动词can, may, must等)，从句也用一般现在时。例如：You must see the doctor if you are ill. 如果你生病了，就必须去看医生。（2）如果主句是一般将来时态，从句不要用一般现在时。 I won’t go there with you if it rains tomorrow. 如果明天下雨的话，我就不和你一起去那儿了。 If we do nothing, there will be only standing room on the earth. 假如我们不采取任何措施，地球上将只有站的地方了。 Ⅰ.单项选择 1. If you _____ to the party, you’ll have a great time. A. will go B. went C. go D. going 2. I ____ her the answer if she ____me. A. can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks 3. – What are you going to do tomorrow? --We’ll go to the library tomorrow if it ___. A. isn’t rain B. rain C. won’t rain D. doesn’t rain 4. What will you do if you _____ to the old man’s home? A. go B. went C. going D. will go 5. If I eat ____ food, I’ll be very fat. A. too many B. many too C. too much D. much too 6. I’ll give the book to him if he ___ here next Sunday. A. will come B. comes C. is coming D. came 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 Peking University.

if引导的条件状语从句

ll be late. t come. ll just bring potato chips if 引导的条件状语从句（讲义）状语用来表示行为发生的时间、地点、目的、方式、程度等，通常由副词或介词短语充当，也可由一个句子充当。 I slept at home yesterday because I had a bad cold. 状语从句状语从句指句子作状语。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式等从句。状语从句一般由连词（从属连词）引导。 I will go to school by bike tomorrow if it is sunny. Grammar focus —I think I ' ll take the bus to the party. —If you do, you ' ll be late. If you take the bus to the party, you —I think I ' ll stay at home. —If you do, you ' ll be sorry. If you stay at home, you ' ll be sorry. —What will happe n if they have the party today? ——If they have it today, half the class won —Should we ask people to bring food? —If we ask people to bring food, they and chocolate. 1 if 在本单元句中意为“ _______________ ； _______ ”，用于引导即if 引导的是一个完整的句子，所以一定要有主谓，成为从句，另一个句子则成为主句。 If you go there, I ' ll go, too. We will go hiking if it doesn ' t rain tomorrow. If Bob leaves tomorrow, I will hold a party for him toni ght. 2 if 引导的条件状语从句既可以放在主句前，也可放在主句后。但是如果放在主句前，即句首时，从句后面要用与主句隔开。 You will keep healthy if you do more exercise. If you do more exercise, you will keep healthy.

If引导的条件状语从句大盘点

If 引导的条件状语从句大盘点一．条件状语从句表示主句动作发生的条件。引导条件状语从句的连词不多，初中阶段最常用的引导词为If（如果）。切记：引导条件状语从句的If，不能用whether来替换。例句： (1)Please call me if he is at home.(假如他在家,请给我打电话。) (2)You must see a doctor if you are ill.(如果你生病了,就必须去看医生。) (3)Don’t go to the beach if it rains.(倘若下雨就不要去海滩了。) (4)If it rains tomorrow, I won’t go there with you.（如果明天下雨的话，我就不和你一起去那儿了。）二．条件状语从句的时态： 1．主句用一般将来时，条件状语从句用一般现在时表将来。如：例句(4) 2．当主句含情态动词时，条件状语从句用一般现在时。如：例句(2) 3．当主句为祈使句，条件状语从句用一般现在时。如：例句(1)和(3) 三．正确区分If 引导的条件状语从句和If 引导的宾语从句在宾语从句中If为“是否”，如表示“将来”时，则用将来时态，宾语从句一般位于主句之后；而在条件状语从句中If的意思为“如果”，主句用一般将来时，从句用一般现在时表将来，且从句位置比较灵活，可位于主句之后也可位于主句之前。请比较： If you keep on working hard at English，you can learn it well. 如果你继续努力学习英语，你就能够学好它。（条件状语从句） My little brother wants to know if my father take him to the zoo on Sunday. 我的小弟弟想知道星期天我父亲是否将带他去动物园。（宾语从句）四．If 引导条件状语从句与祈使句的转换：主语为you的条件状语从句还可与“祈使句+ and / or + 简单句” 句式互换。例如：If you work harder，you’ll pass the exam.= Work harder，and you’ll pass the exam. If you don’t hurry up, you’ll miss the train. = Hurry up,or you’ll miss the train. 如果不可能发生的事情，用过去时。 I I were you, I wouldn’t do that. 主将从现