条件状语从句初二英语
初中英语条件状语从句知识点总结
初中英语条件状语从句知识点总结
条件状语从句是英语中常见的一种从句类型，用来表示一个条件或假设。
以下是初中英语中关于条件状语从句的知识点总结：
1. 引导条件状语从句的连词有：if，unless，as long as，
provided/providing (that)，suppose/supposing (that)，on
condition that等等。
2.当主句的谓语动词是一般将来时，条件状语从句可以使用一般现在
时表示将来情况。
3.如果条件状语从句前面有逗号，通常表示条件状语从句位于句首，
这时主句与条件状语从句之间可以互换位置。
4. 有些情况下，条件状语从句可以省略if。
例如：
- 在含有情态动词的主句中，后面的条件状语从句可以省略if，如：You can go if you want. (可以省略if)
- 在含有was/were to或had的主句中，后面的条件状语从句可以省
略if，如：If I were you, I would study harder. (可以省略if)
5. 当条件状语从句的主语与主句的主语一致时，可将条件状语从句
转化为省略式，如：If it rains, we will stay at home. (如果下雨，
我们将呆在家里)可以转化为：Raining, we will stay at home. (下雨
的话，我们将呆在家里)
需要注意的是，以上总结的知识点并不是绝对适用于所有情况，具体
用法还要根据上下文语境来确定。
在学习中，可以通过大量的阅读和练习
来加深对条件状语从句的理解和运用。
八年级英语语法专讲状语从句
八年级英语语法专讲——状语从句状语从句用来修饰主句中的动词，副词和形容词的从句叫状语从句。
根据其含义状语从句可分为时间状语从句，地点状语从句，条件状语从句，原因状语从句，结果状语从句，比较状语从句，目的状语从句，让步状语从句。
时态遵从主过从也过，主将从现在1. 时间状语从句(1)时间状语从句常用when, as, while, before, after, since, till, until, as soon as等连词来引导。
例如：While he was doing his homework, the telephone rang.2. 条件状语从句(1)条件状语从句通常由if, unless引导。
例如：What shall we do if it snows tomorrow?Don’t leave the building unless I tell you to.3. 原因状语从句(1)原因状语从句通常由because, since, as引导。
例如：He didn’t come to school because he was ill.(2)because表示直接原因，语气最强。
Because引导的原因状语从句多放在主句之后。
回答由why提出的问题，只能用because。
As和since语气较弱，一般用来表示明显的原因。
由as和since引导的原因状语从居多放在句首。
例如：------Why aren’t going there?------Because I don’t want to.As he has no car, he can’t get there easily.(3)because和so不能同用在一个句子里。
4. 结果状语从句(1)结果状语从句由so…that, such…that, so that引导。
例如：He is so poor that he can’t buy a bike for his son.(2)so…that语such...that可以互换。
初中英语知识点总结：条件状语从句
引导条件状语从句的连接词主要有：if(如果）、unless（除非）或as long as（只要）等。
unless在意思上等于if...not。
一、条件状语从句用法1、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。
2、unless = if...not.除非,若不,除非在……的时候例如：Let's go out for a walk unless you are too tired.=If you are not too tired, let's go out for a walk.Unless it rains, the game will be played.除非下雨,比赛将照常进行。
3、so/as long as只要例句;Y ou may borrow my book as long as you keep it clean. 只要你保持书的清洁，你就可以把我的书借去。
So long as you’re happy, it doesn’t matter what you do. 只要你高兴，你做什么都没有关系。
二、时态问题在条件状语从句中，要注意“主将从现”的规定，即主句用一般将来时，从句用一般现在时表示将来时。
例句：I will come to see you if I have time. 我有时间，我就来看你。
【初中英语】初中英语语法大全之条件状语从句
【初中英语】初中英语语法大全之条件状语从句【—之条件状语从句】下面就是老师为同学们带来的条件状语从句的详细讲解，供同学们学习的参考。
条件状语从句1、与现在事实恰好相反若与现在事实相反，虚拟语气的条件从句的谓语用过去式(be通常用were)，主句谓语用“should(would,could,might)+动词原形”。
如：ifiwereyou,iwouldtakeanumbrella.如果我就是你，我会拎把伞。
（事实上我不可能将就是你）ifiknewhernumbericouldringherup.要是我知道她的电话号码，我就可以给她打电话了。
(事实上我不知道)2、与过去事实恰好相反若与过去事实相反，从句：主语+haddone，主句：主语+should/would/could/might+havedone ，例如：ifi'dleftsooner，i'dhavebeenontime.要是我早点动身，我就按时至了。
(但我动身太迟了)ifihadgotthereearlier,ishould/couldhavemether.如果我早到那儿，我就会见到她。
（事实：去晚了）3、与将来事实恰好相反从句：①if+主语+weretodo主句：①主语+should/would/could/might+do②if+主语+did/were②主语+should/would/could/might+do③if+主语+should+do③主语+should/would/could/might+do比如：ifhewent，wouldyougotoo?如果他回去，你也回去吗?(大概他不能回去)注意与说明：对于与将来事实相反的情形，请注意以下几点：一就是这里说道的与将来事实恰好相反，实乃对将来情况的推断；二是此用法中的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“wereto+动词原形”(表示与将来事实相反的假设)；三就是当条件从句采用“should+动词原形”这样的谓语时，主句谓语除需用“should(would,could,might)+动词原形”这样的虚拟语气外，也需用陈述语气或命令式语气。
英语中考条件状语从句讲义
在条件状语从句中，用一般现在时代替一般将来时，用一般过去时代替过去将来时。
If the weather is bad next week, we'll put off the climbing if I worked hard he would buy me a gift.爸爸告诉我，如果我努力学习，他会给我买一份礼物。
3.as /so long as引导的条件状语从句--
as /so long as的意思是"只要"，如：
As long as you don't give up, you will succeed.只要你不放弃,你就会成功。
So long as you're happy, I will be happy.只要你高兴，我就高兴。
1)Unless it rains, the game will be played.除非下雨，比赛将照常进行。
2)We will climb the mountain tomorrowunlessit rains.除非下雨,否则明干我们将去爬山。
we will climb the mountain tomorrowifit doesnotrain.如果明干不下雨,我们将会去爬山。
四、条件句与简单句的关系
“祈使句+and（or，then）+简单句（用一般将来时）”=“if/unless条件状语从句+主句”
4.once引导的条件状语从句--
once意为”一旦........就”，从句可置于主句前或后。如：
Once you begin, never stop.一旦开始，就绝不要停止。
Maths is easy to learn once you understand the rules.一旦你理解了规则，数学就不难学了。
条件状语从句的英语
条件状语从句的英语条件状语从句（Conditional Clause）在英语语法中指的是描述某种条件的从句，通常由一个条件状语从句引导词（如if、unless、provided that等）引导。
条件状语从句是复合句中的一种，用于表示假设条件和可能的结果。
以下是一些常用的条件状语从句：If it rains, we will stay indoors.如果下雨了，我们会呆在室内。
Unless you finish your homework, you can't go out to play. 除非你完成了作业，否则不能出去玩。
Provided that you arrive on time, we can start the meeting. 只要你准时到达，我们就可以开始会议。
Supposing you win the lottery, what will you do with the money? 假设你中了彩票，你会拿这笔钱做什么？In case of emergency, break the glass and press the button.万一出现紧急情况，打破玻璃并按下按钮。
Whether or not you pass the test depends on how well you prepare. 你是否能通过考试取决于你的准备情况。
Provided you don't mind, we can share the room.只要你不介意，我们可以共用一个房间。
If you want to succeed, you need to work hard.如果你想要成功，你需要努力工作。
Unless there is a change in plans, we will meet at the park tomorrow.除非计划有变，否则我们明天在公园见面。
八年级上册英语unit10条件状语从句讲解
Unit10 If you go to the party, you’ll have a great time一、词汇Unit3外向的较好的工作努力的比赛极好的赢得不过adv;尽管有才干的必要的谚语感动，触摸相像的分享Unit9在周六下午为……做准备去看医生患感冒放学后为考试学习前天后天照看接受邀请拒绝盼望，期盼书面回复…….的开幕式去听音乐会客人日历高兴，愿意邀请函有空的，可获得的二、单元语法条件状语从句It will be sunny tomorrow.I’ll visit the museum.If it is sunny tomorrow, I’ll visit the museum.一、连接词if, unless（除非=if…not）, once(一旦), in case （万一，以防）If you are hungry，you can get something to eat.Unless you are careful enough, you’ll have an accident.=If you are not careful enough, you’ll have an accident.（careless）Once you start, you will never give up.Take a hat with you in case the sun is very hot二、考点1、主将从现----连接词所在的句子是从句。
2、含义等于祈使句+and(or)+陈述句If you don’t hurry up, you’ll be late=Hurry up, or you’ll be late.If you study hard, you will pass the exam.= Study hard, and you will pass the exam. 3、表示条件的时间状语从句也要主将从现，连接词：when, as soon asI’ll call you as soon as I arrive in Shanghai. (reach, get to, arrive at )What is your friend going to be when he grows up.三、单元重点词汇1、orderv（1）订购，点菜~some fish（2）命令~ sb to do sth .My father ordered me to finish the homework.为了in order to I get up early every morning in order to catch the early bus.2、advicea piece of~ two pieces of ~ give sb some adviceget advice from 从…..中获取建议advise sb (not) to do 建议某人做,advise sb about/on 关于…给某人建议on study3、talk with/to 与某人谈论talk about 谈论4、be afraid to do=be afraid of doingI’m afraid to speak in class= I’m afraid of speaking in class条件状语从句练习1.(2010潍坊中考)You have to leave now________you can catch the early bus..A.so that B.as soon as C.because D.if2. (2010上海中考)We will have no water to drink _______we don’t protect the earth.A.untilB.beforeC.thoughD.if3.(2010·铜仁中考）— May I go to the concert with you?—I’m afraid not ____ you have a ticket, because I have only one.A. sinceB. ifC. unlessD. though4.（2011哈尔滨）As we all know, planting trees is good for the environment. Our class will go to the Sun Island tomorrow. As soon as we there, we’ll begin to plant tree s.A. arrivedB. arriveC. will arrive5.（2011广东）—Let’s go fishing if it _____ this weekend.—But nobody knows if it _______.A. is fine, will rainB. will be fine, rainsC. will be fine, will rainD. is fine; rains6.(2011黑龙江齐齐哈尔）I’m waiting for my friend. , I’ll go shopping a lone.A. If she comesB. If she doesn’t comeC. If she won’t come7.（2011重庆江津）If she here tomorrow, I will tell you.A. comesB. will comeC. comeD. came8.（2011山东滨州）—Mary, could you tell me if your mother ________ our school sports meeting tomorrow?—I th ink she will come to school if she _________ free.A. will take part in; will beB. takes part in; isC. will take part in; isD. takes part in; will be9.（2011山东泰安）—Tom wants to know if you will have a picnic tomorrow.—Yes. But if it ______, we’ll play chess instead.A. will rainB. rainedC. is rainingD. rains10.（2011山东潍坊）If Tom _____ the game, we'll give him a surprise".A. winB. winsC. wonD. miming11.（2011浙江宁波）— I hear the famous singer Xu Song may come to Ningbo next month.— Really? _______ he comes, my younger sister will be very excited.A. IfB. UntilC. UnlessD. Before12.（2011雅安）The students ________ have a sports meeting this weekend if it ________.A. won’t; rainsB. will; rainsC. won’t; will rainD. are going to; is going to rain13.（2011湖南湘西）Don’t talk loudly a t the meeting. If you ________, you will have to leave.A. doB. areC. did14.（2011湖南益阳）I don't know if she to my birthday party tomorrow. If she , I'll be very happy.A. comes; comesB. will come; comesC. comes; will come15.( 2011大庆) — When will you come to Daqing?— I will call you _____I arrive.A. tillB. whileC. as quickly asD. as soon as16.（2011广西崇左）I’ll give it to Jim as soon as I ____him tomorrow.Asaw B.will see C.see D.have seen17.（2011北京）I will send you an e-mail as soon as I____ in Canada.A. arriveB. arrivedC. am arrivingD. will arrive18.（2011陕西）If there no buying and selling of animals, there no killing in nature.A. is; will heB. will be; will beC. is; isD. will be; is19.（2011黑龙江绥化市）I’m waiting for my friend. _, I'll go shopping alone.A. If she comesB. If she won't comeC. If she doesn't come20.（2011内蒙古包头）You can’t watch TV ________ you finish your homework.A. beforeB. ifC. whileD. as21.(2012.安徽省）-- What's your plan for the summer holidays?--I’ll go to Beijing_____ the school term ends.A. in order thatB. so thatC. as soon asD. even though22.（2012福建福州）— We'll go for a picnic if it____________this Sunday.— Wish you a lovely weekend.A. rainB. doesn't rainC. won't rain23.（2012年广东省）— If our government _____attention to controling(控制) 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 be24.（2012湖北黄冈）—Excuse me. Could you wake me up when my friend____ here?—Of course. [:hat we still don't know when your friend _____ here.A. comes; will comeB. comes；comesC. will come; comesD. will come；will come25.（2012四川成都）—I want to know when Mr. Brown will arrive.—When he , I will tell you.A. will arriveB. arrivedC. arrives26.（2012四川雅安市）If a polar bear_____, it _____fish from the water.A. will be hungry; catchesB. is hungry; will catchC. is going to be hungry; catchesD. is hungry; won’t catch27.（2012浙江衢州）We Will go for a picnic if it_______tomorrow.A. doesn't rainB. wasn't rainyC. won't rainD. wasn't raining28.（2012贵州六盘水）-Do you know if we will go for a picnic this Saturday?-I think we will if we any classes.A. won ' t haveB. didn’t' t haveC. don't haveD. aren ' t having29.（2012贵州铜仁）The bus driver always says to us ,―Don’t get off________ the bus stops.‖A. whenB. while C .until D. if30.（2012山东·东营市）– Excuse me, can I interview Mr. Miller this afternoon?-- A moment, please. Let me check .A. i f Mr. Miller will be freeB. when will Mr. Miller have timeC. if Mr. Miller had an appointmentD. when does Mr. Miller come back31.When I ____home yesterday evening, my father _____TV。
知识点名：状语从句（条件、让步）
知识点名：状语从句（条件、让步）讲义：一、条件状语从句条件状语从句的定义条件状语从句就是在复合句中表示主句动作发生条件的状语从句。
引导条件状语从句最经常用的连词是if，它的意思是“如果”；除此之外，还有其他一些连词，也可用于引导条件状语从句。
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. 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。
例句：I don't know if it will rain tomorrow. But if it rains tomorrow, I'll stay at home. 不知道明天是否会下雨，但要是下雨的话，我就呆在家里。
句中的第一个if 引导的是宾语从句(if=是否)，从句谓语用将来时态表示将来意义；第二个if引导的是条件状语从句(if=如果)，从句谓语要用一般现在时表示将来意义。
二、让步状语从句引导让步状语从句的连词有though、although和as等。
though和although表示“虽然，纵然”之意，在一般情况下可以互换使用。
在口语中，though较常使用，although比though正式，二者都可与yet或still连用。
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2015-12-20条件状语从句1、定义由引导词if或unless引导的状语从句叫做条件状语从句。
在英文中，条件是指某一件事情实现之后(状语从句中的动作)，其它事情(主句中的动作)才能发生，通常译作"假如"。
(注意:在含有条件状语从句的复合句中，表示将来时态，主句是态,或谓语动词是，从句要用态,即[原则]。
Eg1: Take the medicine, you will be fine.Eg2: If you can read as many English books as possible, your English will be improved.2、用法语法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if引导的条件状语从句既可以将从句放前面也可以将从句放后面。
除了if 之外，还有其他连词也可以引导条件状语从句。
【注：在条件状语从句中，绝大数情况下some要变为any。
】(1) unless conj.除非，若不，除非在……的时候Eg1: You will fail to arrive there in time unless you start earlier.如果你不早点动身，你就不能那儿。
Eg2: 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)...引导的是主句事件发生的前提条件或唯一条件。
Eg1: I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相，条件是你答应保密。
Eg2: 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。
Attention（注意）：①unless = if...not. Eg: Let's go out for a walk unless you are too tired.If you are not too tired, let's go out for a walk.②if 引导的有和两种：真实条件句Eg：If it rains tomorrow, we won’t go on a park非真实条件句是的一种，表示与事实相反，主句用would do，从句用过去式，具有假设性，一定不会是真的,即所假设的事情基本不会有发生的可能。
Eg：If I were you, I would go with him.③so/as long as （只要）、in case（万一）引导。
Eg1: So long as you’re happy, it does n’t matter what you do. 只要你高兴，你做什么都没有关系。
You may borrow my book as long as you keep it clean只要你保持书的清洁，你就可以把我的书借去。
Eg2: Take your umbrella in case it rains. 带着你的伞吧，以防下雨。
④“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”。
Eg1:If you work harder, you’ll pa ss the exam.= Work harder, and you’ll pass the exam. 如果你再努力些，你就会通过考试。
Eg2: If you don’t hurry up, you’ll miss the train.= Hurry up, or you’ll miss the train. 如果你不快点儿，你就赶不上火车了。
3、练习题Ⅰ.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．I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks5. – 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 rain6.—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 come7. What will you do if you _____ to the old folk’s home visit?A. goB. wentC. goingD. will go8. If I eat ____ food, I’ll be very fat.A. too manyB. many tooC. too muchD. much too9. I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came10. There ____an English film in our school tomorrow.A. is going to haveB. will haveC. is going to beD. has11. 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 held12. When my mother returned last night, I ____ a book.A. readB. am readingC. was readingD. am going to read13. What ____ you ____ when it began to rain?A. do, doB. were, doingC. are, doingD. did, do14. I’ll wake you up when he ____back.A. willB. is going to comeC. comesD. comeII. 同义句转换1. Run fast, or you’ll be late for school._______ you _______ _______ fast, you’ll be late for school.2. You can buy the dictionary if you take enough money with you.Take enough money with you, ______ _____ ______ buy the dictionary.3. If there is no air, none of us can live.None of us can live _______ _________.Ⅲ、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(过时).7. The twins ______(fight)（打架）if they_____(argue).8. Peter ____( send) me a beautiful souvenir （纪念品）if he ____(tour) Spain.9. If Mr Green _______ (say) I am hard- working, my parents ___( feel) glad.10.I ______(go) to the beach if it______( not rain) this week.11. _____they ___( have) a match if the P.E. teacher __(be) busy?12.He ____(write) a letter to his grandparents if he ____(get) his report card this week.13. If she ____(get) up late, she ____( not catch) the early bus.Ⅳ.完成句子1.如果他到得晚了会发生什么事情？What ______ ______ if he ______ late?2. 如果努力学习，你就会取得好成绩。