if引导的真实条件句
If引导条件句的用法
If 引导条件句的用法1、真实条件句用于陈述语气,假设的情况可能发生,其中if 是如果的意思;时态关系句型:条件从句主句一般现在时shall/will + 动词原形If he comes, he will bring his violin.典型例题The volleyball match will be put off if it ___.A. will rainB. rainsC. rainedD. is rained答案B;真实条件句主句为将来时,从句用一般现在时;注意:1 在真实条件句中,主句不能用be going to表示将来,该用shall, will.错If you leave now, you are never going to regret it.对If you leave now, you will never regret it.2 表示真理时,主句谓语动词便不用shall will +动词原形,而直接用一般现在时的动词形式;2 非真实条件句1时态:可以表示过去,现在和将来的情况;它的基本特点是时态退后;a. 同现在事实相反的假设;句型:条件从句主句一般过去时should would +动词原形If they were here, they would help you.b. 表示于过去事实相反的假设;句型:条件从句主句过去完成时shouldwould have+ 过去分词If she had worked harder, she would have succeeded.The rice would not have been burnt if you had been more careful.If my lawyer had been here last Saturday, he would have prevented me from going.If he had come yesterday, I should / would have told him about it.含义:He did not come yesterday, so I did not tell him about it.If he had not been ill and missed many classes, he would have made greater progress.含义:He was ill and missed many lessons, so he did not make greater progress.c. 表示对将来的假想句型:条件从句主句一般过去时should+ 动词原形were+ 不定式would + 动词原形should+ 动词原形If you succeeded, everything would be all right.If you should succeed, everything would be all right.If you were to succeed, everything would be all right.3 混合条件句主句与从句的动作发生在不同的时间,这时主,从句谓语动词的虚拟语气形式因时间不同而不同,这叫做混合条件句;If you had asked him yesterday, you would know what to do now.从句与过去事实相反,主句与现在事实相反;If it had rained last night 过去, it would be very cold today 现在.4 虚拟条件句的倒装虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略,再把were, should或had 移到从句句首,实行倒装;Were they here now, they could help us.=If they were here now, they could help us.Had you come earlier, you would have met him=If you had come earlier, you would have met him.Should it rain, the crops would be saved.=Were it to rain, the crops would be saved.注意:在虚拟语气的从句中,动词’be’的过去时态一律用"were",不用was,即在从句中be用were代替;If I were you, I would go to look for him.如果我是你,就会去找他;If he were here, everything would be all right.如果他在这儿,一切都会好的;典型例题_____ to do the work, I should do it some other day.A. If were IB. I wereC. Were ID. Was I答案C. 在虚拟条件状语中如果有were, should, had这三个词,通常将if省略,主语提前, 变成were, should, had +主语的形式;但要注意,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.5 特殊的虚拟语气词:should1 It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要用should 加动词原形, should 可省略;句型:1suggestedIt is 2important that…+ should do3 a pity1suggested, ordered, proposed, required, demanded, requested, insisted;+ should do2important, necessary, natural, strangea pity, a shame, no wonder3It is suggested that we should hold a meeting next week.It is necessary that he should come to our meeting tomorrow.2在宾语从句中的应用在表示命令、建议、要求等一类动词后面的从句中;order, suggest, propose, require, demand, request, insist, command, insist + should doI suggest that we should hold a meeting next week.He insisted that he should be sent there.注意:如suggest, insist不表示"建议" 或"坚持要某人做某事时",即它们用于其本意"暗示、表明"、"坚持认为"时,宾语从句用陈述语气;The guard at gate insisted that everybody obey the rules.判断改错:错You pale face suggests that you should be ill.对Your pale face suggests that you are ill.错I insisted that you should be wrong.对I insisted that you were wrong.3在表语从句,同位语从句中的应用在suggestion, proposal, idea, plan, order, advice等名词后面的表语从句、同位语从句中要用虚拟语气,即should+动词原形;My idea is that we should get more people to attend the conference.I make a proposal that we should hold a meeting next week.。
(完整版)if引导的条件句中的虚拟语气
if引导的条件句中的虚拟语气虚拟语气表示一种不能实现的假设。
该语法主要用于if条件状语从句。
一、if引导的条件状语从句的分类及虚拟条件句的判断1、可以把条件句分为两类:1).真实条件句(Sentences of Real Condition):凡是假设的情况发生性可能很大,就是真实条件句。
例如:⑴、If I have time , I will help you with this work.如果我有时间会帮助你做此工作的。
(2)、If time permits, we'll go fishing together.(如果有时间的话,我们就一起去钓鱼。
)2).虚拟条件句(Sentences of Unreal Condition):当假设是不大可能实现时,就是虚拟条件句。
例如:⑴、If I were you , I would have attended the meeting. 如果我是你的话,就去参加会议了。
⑵、If he had come here yesterday, he would have seen his old friend.假如他昨天来这儿的话,就会看见他的老朋友。
⑴、If it had rained yesterday, we would have stayed at home.(如果昨天下雨的话,我们就会留在家里。
)2、.if条件状语从句中虚拟语气的判断判断是真实条件句还是非真实条件句。
只有在非真实条件句中才使用虚拟语气。
通过句子意思,看假设的条件是否能够实现,能够实现是真实条件句,不能使用虚拟语气;假设的条件不能实现则是非真实条件句,要用虚拟语气。
判断这个假设是与哪个事实相反。
通常有三种情况:①与过去事实相反。
②与现在事实相反。
③与将来事实可能相反。
3、“后退一步法”后退一步法是指在准确地判断了该句与哪一事实相反后,按虚拟语气的后退一步法处理从句谓语动词的时态。
if引导的虚拟条件句
if引导的虚拟条件句1、虚拟语气If引导的真实条件句(16):1.主将从现Ifsheshowsup,we’llstickwithher.I’llgiveyouacallifanything comesup.语法深化I’llkickyououtifdon’tlistentome.2.主祈从现Catchmeifyoucan.Lovemeifyoudare.Ifhecomes,heisgoingtobringh isviolin.虚拟语气If引导的虚拟条件句:1.与如今事实相反的假设条件从句主句一般过去时should(wouldcould)+动词原形语法深化假如我是你,我不会让他走。
=If2、Iwereyou,Iwouldnotlethimgo.假如我能飞,你就抓不到我。
=IfIcouldfly,youwouldnotcatchme.虚拟语气If引导的虚拟条件句:2.与将来事实相反的假设条件从句主句一般过去时should(wouldcould)+动词原形动词原型语法深化Wereto+Should+动词原型Ifyoushouldsucceed,everythingwouldbeallright.Ifyouweretosuc ceed,everythingwouldbeallright.虚拟语气If引导的虚拟条件句:3.与过去事实相反的假设条件从句3、主句Haddonewould,should,could+havedone语法深化Ifhehadcomeyesterday,Ishould/wouldhavetoldhimaboutit.Ifheha dnotbeenillandmissedmanyclasses,hewouldhavemadegreaterprogr ess.虚拟语气If引导的虚拟条件句:4.混合虚拟语气Ifyou_______himyesterday,you______whattodonow.(ask,know)语法深化〔从句与过去事实相反,主句与如今事实相反。
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和宾语从句
If的用法if 的条件从句分为真实条件从句和虚拟条件从句;真实条件从句:真实条件从句适用于主将从现,是假设有可能发生的;一.位置在if 引导的条件状语从句中,既可以放在主句之前,也可以放在主句之后;若if 条件句放句首,从句后面要加逗号,和主句隔开;You will catch the bus if you get up early. = If you get up early, you will catch the bus.二.时态1.主祈从现主句:一般现在时态包含祈使句和含有情态动词can, may, must等的句子从句:一般现在时态2. 主将从现主句:一般将来时态从句:一般现在时态3.从句:现在进行时,主句:一般将来时If you are looking for Peter you’ll find him upstairs. 如果你是在找彼得,上楼就会找到他;4.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. 如果你吃完了,我就叫服务生来算账5.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.三.注意事项1.在if 引导的条件状语从句中,当主句是一般将来时态时,不能使用be going to 结构,而要用will.2.在if 引导的条件状语从句中,不能使用some,而要用any.四.同义句转化1.借助于祈使句+and∕or+简单句转化,and表示顺承,or表示转折;例如:1If you work hard, you’ll pass the exam.Work hard, and you’ll pass the exam.2If you do n’t hurry up, you’ll be late.Hurry up, or you’ll be late.2.借助于介词with或者without 来转换例如:If you help me, I’ll finish my job soon.With your help , I’ll finish my job soon.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;虚拟条件从句:虚拟条件从句是假设不太可能发生的;IF的虚拟语气有三种:内容从句主句与现在事实相反动词过去式be用were would/could/should/might+动原与将来事实相反 should/were to+动原 would/could/should/might+动原与过去事实相反 had+过分 would/could/should/might+ have+过分下面三句依次是上面三种情况的例句:If I were you ,I would/could/should/might do that.If I had know that yesterday, I would/could/should/might have told you .If it should rain , the crops would/could/might be saved.If引导的宾语从句一. if 引导宾语从句时,意思为:是否,从句的时态通常要和主句保持一致;例句 I want to know if he lives there. 我想知道他是否住在那儿; He asked me if I could help him. 他问我是否能帮他;考查点if、whether引导的宾语从句的区别 1. if或whether引导宾语从句时,作“是否”讲,常放在动词ask、see、say、know和find out等后面;一般情况下,两者常可换用,在口语中多用if;例句 Nobody knows whether / if it will rain tomorrow. 没有人知道明天是否下雨; Lucy asked whether / if they had a cotton sweater. 露西问他们是否有棉制的毛衣;二. 注意事项:if或whether引导宾语从句时,要注意三个方面,即连词、语序和时态;1. if或whether既不能和that 或其他连词副词同时使用,也不能省略;例句我不知道他今天是否会来;误 I don’t know that ifwhether he will come here today.正 I don’t know ifwhether he will come here today. 他走过来看看猫是否出了毛病; 误 He came to see what if whether there was anything wrong with his cat .正 He came to see if whether there was anything wrong with his cat .2.if或whether引导宾语从句时,虽具有疑问的意义,但其从句应用陈述句的语序;例句Did you know the way to the hospital The old woman asked me.The old woman asked me if / whether I knew the way to the hospital. 老妇人问我是否知道去医院的路;3.if或whether引导的宾语从句应和主句的时态保持一致;即主句为一般现在时,从句用任一种时态;主句为一般过去时,从句则用过去时中的任一种时态;例句 I don’t know if whether he has come here. 我不知道他是否来过这儿;Tom asked if whether I had read the book. 汤姆问我是否看过这本书; 三.If 和whether两者不能互换的情况1. 只能用whether的情况在动词不定式之前只能用whether:例句 I can’t decide whether to stay. 我不能决定是否留下;2. 在whether …or not 的固定搭配中:例句 I want to know whether it’s good news or not. 我想知道它是不是好消息;3. 在介词后,只能用whether:例句 His father is worried about whether he loses his work.他的父亲担心他是否会失去工作;4.用if会引起歧义时:例句 Could you tell me if you know the answer 这句话有两种意思:“你能告诉我你是否知道答案吗”或“如果你知道答案,请告诉我,好吗”; 如用whether则可避免歧义;考题链接 I don’t know _________ they could pass the exam or not.A. whyB. ifC. thatD. whether答案:D 解题思路:本题考查if与whether的区别,在whether…or not的固定搭配中通常只用whether;练习题:句型转换 1. Do they want fried chicken He asked the boys.改为宾语从句He asked the boys _______they ______fried chicken.2. Was the watch made in Shanghai I don’t know.改为宾语从句I don’t know _______the watch _______made in Shanghai.3. “Do you want to try something new ” Tom’s mother asked him.同义句转换Tom’s mother asked him _____________________to try something new.答案:1. if / whether, wanted 2. if / whether, was 3. if / whether he wanted 一、用所给词的适当形式填空1.If you ________feel tired, you _______________ have to have a rest.3. If there __________be fewer trees, there _______________ be more p ollution.5. If Marcia _____________live alone, she ___________________ keep a p et parrot.6. Lana ________________ buy a new dress if the old one ____________ be out of style.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.13.He ____write a letter to his grandparents if he ____get his repor t 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 Pekin gUniversity.16. 如果努力学习,你就会取得好成绩;If you__________ _________, you ___________ good _____________.17. 他如果看电视太久了,他的父母会不高兴;If he _________ TV too much, his parents __________ __________ u nhappy.18. 如果我们为他组织生日聚会,大家都会来的;Everyone ________________ if we _____________ a birthday party ______ ____ him.19. 如果明天不下雨,我会和你一起去公园的;If it __________ __________ tomorrow, I ______________ go to the park _________ you.21. 如果他有空,他会帮助你的;If he _________________, he _________________ you.23. 你如果抄同学的作业就不能学好各门功课;You _______ _____ good at all the subjects if you ______ the oth er students’homework.Ⅰ单项选择1.If you _____ to the party, yo u’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 fin ishD. before, finishes.3. What will father _____ us from JapanA. 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 visitA. 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. h as12. 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 rea d14.What ____ you ____ when it began to rainA. do, doB. were, doingC. are, doingD. did, do15. I’ll wake you up when he ____back.A. willB. is going to comeC. comesD. come1---5 CDBAD6---10 DAACB11---15 CBCBC。
if引导的条件状语从句讲解
条件状语从句在句子中做条件状语的从句称为条件状语从句。
通常置于句首或句尾。
一.条件状语从句通常由if(), unless(),as long as()引导。
例如If we pay much attention to the earth, we'll have a better world.如果我们多关爱地球,就会拥有一个更美好的世界If it rains tomorrow, what shall we do?如果明天下雨,我们怎么办?尝试一下:(补全句子)If it rains tomorrow, we won’t go to the park.______________________________________。
Unless weather stops me, I go for a walk every. 我每天都会去散步,除非遇上坏天气。
只要我们竭尽全力,父母就会满意我们的表现。
Our parents will be pleased with our performance _____ _____ ______ we try our best.二、if引导的条件状语从句(1)“if从句+祈使句”的句子。
其实,if作为一个连词,主句也可以是其他形式的句子。
例如:If you want to go, please let me know.If the green light isn’t on, wait for a minute.}()(2)“祈使句+ and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。
注意:A. “祈使句+ and + 陈述句”可以转化为if引导的肯定条件状语从句,而且主语是第二人称。
B. “祈使句+ or + 陈述句”可以转化为if引导的否定条件状语从句,而且主语是第二人称。
例如:Study hard and you will pass the exam. =_________________________________________.Hurry up, or you’ll be late. =__________________________________________________..考题(2010重庆中考)Work hard,________ you may catch up with your classmates soon.A.orB.butC.andD.yet黑色陷阱:本题的陷阱是句型,本句型区别于“祈使句+or”,这个句型的含义是“……,不然的话/否则……”。
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条件状语从句
Lesson137-138 if引导的真实条件句(真实条件句)
一:if的含义:
●If是个连词,译为“如果”
●一般引导条件状语从句,表示“如果(不)…就(不)….”
真实条件句(第一条件句)假设的情况有可能发生,是真实条件句。
二:真实条件句:
●一般结构:
1)If +从句(一般现在时),主句(一般将来时will / shall +动词原
形). 【从句在前逗号隔开】
2)主句if从句【主句在前不用逗号隔开】
如果…(不)…就(不)…
●基本用法及其时态选择:
注意:a) 真实条件句中,主句不能用be going to表示将来,该用will/shall.
b) 若表示真理主句可以不用shall (will) + 动词原形,直接用一般现在时即可。
c) 当由if引导的真实条件句表达请求,建议和命令(主句是祈使句或含有情态动词),或when 用于条件状语从句中译为“如果”时,if 和when 可以互换。
E.g: When you are in the classroom, you should be quiet. (表示建议)
When the weather is nicer, we’ll go to the park.(含有“如果”的意思)。
if条件句中的时态应用
if条件句中的时态应用if是高考考查热点之一。
同学们往往把它的时态容易判断错误。
笔者就if中的时态应用总结如下:一.意“如果”表真实条件。
引导真实条件句。
从句要求用一般现在时表将来。
If it rains tomorrow , we `ll stay at home.如果明天下雨的话,我们将呆在家里。
If they come tomorrow , we`ll have a meeting.如果他们明天来的话,我们就开个会。
注意:在表示“愿意”或“不愿意”时,if 后可以跟will 或won’t.。
如:If you won’t go , I’ll go alone.如果你愿意去,我就自己去。
二.意“假如”表虚拟条件。
如果我是一只小鸟,我就会在天上飞。
If I had enough money now, I would lend it to you .如果我现在有足够钱的话,我就会借给你。
If it should rain tomorrow, the race would be put off.如果明天下雨的话,比赛就会推迟。
If you had arrived earlier that day , you might have met her.如果那天你早点到的话,你就会遇见她了。
三.意“是否,是不是”引导间接问句。
当主句为现在时时,从句应用适当的时态。
当主句为过去时时,从句应当遵循时态一致的原则,要采用相应的过去时态。
I don’t know if they will come tomorrow.我不知道他们明天是否会来。
He asked if they would come the next day.他问他们第二天是否会来。
注意:在正式的文件中,若句中有助动词had 、were 、should,则将其提前,省略if.Had it not been for your help,we would not have achieved so much.要不是你的帮助,我们不会取得如此大的成绩。
if引导真实条件句时态用法
if引导真实条件句时态用法
当if引导真实条件句时,一般使用一般现在时态来表示一个普遍的真实情况或状态。
例如:
- If it rains, the ground gets wet.(如果下雨,地面就会湿。
)
- If I eat too much, I feel full.(如果我吃太多,我就会觉得饱。
)
- If you work hard, you will succeed.(如果你努力工作,你就能成功。
)
然而,有时也可以使用一般过去时态来表示过去的真实条件。
这通常发生在间接引语中,当主
句是过去时态时。
例如:
- She said that if it rained, they would cancel the picnic. (她说如果下雨的话,他们会取消野餐。
)总的来说,使用一般现在时态来引导真实条件句是最常见的用法。
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。
初中英语If引导的条件状语从句
中考英语专题复习if引导的条件状语从句一、真实条件状语从句:表示假设在某条件的存在下,主句中的主语可能会发生某种动作或存在某种状态。
主从句时态;(1)从句:一般现在时、现在进行时、现在完成时------主句:一般将来时(2)从句:一般现在时,-------- -----------------------------主句:含情态动词(3)从句:一般现在时,---------------------------------------主句:祈使句※:(4)如果主句描述的是客观真理,采用一般现在时。
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。
If you have finished the homework,you can go home.如果你作业做完了就可以回家了。
另外你还要注意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If he runs he’ll get there in time. 如果他用跑的,他就会及时赶到那儿。
The cat will scratch you if you pull her tail. 如果你拉猫的尾巴,它就会抓你。
(1).if从句用现在进行时,主句用一般将来时If you are looking for Peter you’ll find him upstairs. 如果-你是在找彼得,上楼就会找到他。
(1).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. 如果你吃完了,我就叫服务生来算账(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. 如果雾在大一些,飞机可能就会改在别的机场降落。
初二英语条件句完成中级单选题30题
初二英语条件句完成中级单选题30题1.If it rains tomorrow, we ______ stay at home.A.willB.wouldC.shouldD.shall答案:A。
本题考查if 引导的真实条件句中,主句用一般将来时,从句用一般现在时。
选项A“will”表示将来;选项B“would”用于虚拟语气;选项C“should”表示应该;选项D“shall”用于第一人称。
2.If I have time, I ______ help you with your homework.A.willB.wouldC.shouldD.shall答案:A。
同样是if 引导的真实条件句,主句用一般将来时。
选项 A 符合;选项B 虚拟语气不适用;选项C 应该不符合语境;选项D shall 一般不这么用。
3.If she studies hard, she ______ get good grades.A.willB.wouldC.shouldD.shall答案:A。
理由同上,主句一般将来时。
选项 A 正确;选项 B 虚拟语气不合适;选项C 应该在这里不准确;选项D 用法不对。
4.If we go to the park, we ______ have a picnic.A.willB.wouldC.shouldD.shall答案:A。
if 引导真实条件句,主句一般将来时。
选项 A 符合;选项B 虚拟语气不适用;选项C 应该不符合;选项D shall 不恰当。
5.If he comes to my party, I ______ be very happy.A.willB.wouldC.shouldD.shall答案:A。
依旧是if 引导真实条件句,主句一般将来时。
选项 A 正确;选项B 虚拟语气不适用;选项C 应该在此处不准确;选项D shall 用法错误。
6.If we don't take enough water,we will be thirsty on the hike. We won't be thirsty on the hike unless we_____enough water.A.takeB.tookC.will takeD.would take答案:A。
五年级英语条件句构造高级分析判断单选题30题
五年级英语条件句构造高级分析判断单选题30题1.If it rains tomorrow, we _____ stay at home.A.willB.wouldC.shouldD.can答案:A。
本题考查if 引导的真实条件句中主句的时态。
if 引导的真实条件句中,如果从句用一般现在时,主句用一般将来时。
A 选项will 表示将来;B 选项would 是过去将来时,不符合本题时态要求;C 选项should 表示应该,不是在这个条件句中表示将来的正确用法;D 选项can 表示能够,也不是表示将来的正确用法。
2.If I have time, I _____ help you with your homework.A.willB.wouldC.shouldD.can答案:A。
同样考查if 引导的真实条件句中主句的时态。
从句用一般现在时,主句用一般将来时,A 选项will 正确;B 选项would 是过去将来时;C 选项should 应该,不符合时态要求;D 选项can 能够,不是表示将来的用法。
3.If my mom is free, she _____ cook delicious food for us.A.willB.wouldC.shouldD.can答案:A。
理由同前两题,if 引导的真实条件句中,从句一般现在时,主句一般将来时,A 选项will 表示将来正确;B 选项would 过去将来时错误;C 选项should 应该和D 选项can 能够都不是表示将来的正确用法。
4.If we finish our class early, we _____ play games in the playground.A.willB.wouldC.shouldD.can答案:A。
分析同上,if 引导真实条件句,从句一般现在时,主句一般将来时,A 选项will 正确;B 选项would 过去将来时不对;C 选项should 应该和D 选项can 能够不是此条件句中表示将来的正确用法。
四年级英语条件句完成填空单选题20题
四年级英语条件句完成填空单选题20题1.If it is sunny tomorrow, we ______ go for a picnic.A.willB.wouldC.shouldD.can答案:A。
本题考查if 引导的真实条件句中,主句用一般将来时。
选项A“will”表示将来;选项B“would”用于虚拟语气;选项C“should”表示应该;选项D“can”表示能够。
只有A 符合真实条件句的语法规则。
2.If I have time, I ______ help you with your homework.A.willB.wouldC.shouldD.must答案:A。
同样是if 引导的真实条件句,主句用一般将来时。
选项A“will”符合;选项B“would”用于虚拟语气;选项C“should”表示应该;选项D“must”表示必须。
所以选A。
3.If you study hard, you ______ get good grades.A.willB.wouldC.shouldD.must答案:A。
if 引导真实条件句,主句一般将来时。
选项 A 正确;选项B 虚拟语气;选项C 应该;选项D 必须。
选A。
4.If it rains tomorrow, we ______ stay at home.A.willB.wouldC.shouldD.must答案:A。
此题为if 引导真实条件句,主句用一般将来时。
选项A 符合;选项B 虚拟语气;选项C 应该;选项D 必须。
答案是A。
5.If I am hungry, I ______ eat something.A.willB.wouldC.shouldD.must答案:A。
if 引导真实条件句,主句一般将来时。
选项 A 正确;选项B 虚拟语气;选项C 应该;选项D 必须。
选A。
6.If you don't study hard, you won't pass the exam. It's the same as saying you won't pass the exam unless you study hard. The underlined words “unless you study hard” mean “_____”.A.if you don't study hardB.if you study hardC.even if you study hardD.when you study hard答案:B。
五年级英语条件句构造超级高级练习题40题
五年级英语条件句构造超级高级练习题40题1.If it is sunny tomorrow, we _____ go on a picnic.A.willB.wouldC.shouldD.can答案:A。
本题考查if 引导的真实条件句中,主句用一般将来时。
选项A“will”表示将来;选项B“would”一般用于虚拟语气;选项C“should”表示应该;选项D“can”表示能够。
只有A 符合条件句的语法规则。
2.If I have time, I _____ help you with your homework.A.willB.wouldC.shouldD.can答案:A。
同样是if 引导的真实条件句,主句用一般将来时。
选项 A 正确;选项B 虚拟语气不合适;选项C 应该做某事不是条件句的通常用法;选项D 能够做某事在此语境不如 A 合适。
3.If my mom is happy, she _____ cook my favorite dish.A.willB.wouldC.shouldD.can答案:A。
理由同上,if 引导真实条件句,主句一般将来时。
选项 A 符合;选项B 虚拟语气排除;选项C 和D 不符合该条件句的用法。
4.If it rains tomorrow, we _____ stay at home.A.willB.wouldC.shouldD.can答案:A。
if 引导真实条件句,主句用一般将来时。
选项 A 正确;选项B 虚拟语气不适用;选项C 应该做某事在此语境不合适;选项D 能够做某事也不太恰当。
5.If I finish my work early, I _____ play games.A.willB.wouldC.shouldD.can答案:A。
if 引导真实条件句,主句一般将来时。
选项 A 符合;选项B 虚拟语气排除;选项C 和D 不符合条件句的通常用法。
6.If my dad is free, he _____ take me to the park.A.willB.wouldD.can答案:A。
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2) I want to know if he is a teacher. ↓ whether if 在宾语从句中翻译为“是否”
3.时态呼应
1)主句为一般将来时态,if从句用一般现在 时态(主将从现)。
1.We will stay at home if it rains tomorrow. 2.If 的两面性 2.We are going to stay at home if it rains
tomorrow.
X
注意
在if引导的条件状语从句中,当主句是一般将来 时时,不能够使用be going to结构,而要用will/shall
3.时态呼应
2)主句中含有情态动词,if从句用一般现在 时态(主情从现)
1. If you finish your homework, you can go home now. 2.If的两面性 2.If you drive too fast, you may have an accident.
解析:在if引导的条件状语从句中,当主句是一般将来时时, 不能够使用be going to结构,而要用will,选B
微课程
2.If的两面性
1.主从句的位置
I will stay at home if it rains tomorrow. (主句) (从句) 主从无逗
= If it rains tomorrow , I will stay at home . (从句) (主句) 从主有逗
2.If的两面性
1)We will go out if it is fine tomorrow. ↓如果
初中英语语法 If 引导的真实条件状语从句
主讲:周明艳 单位:甘肃省武威市第八中学
If引导的真实条件句
If引 导的 条件 状语 从句 非真实条件句
一.定义
真实条件句
二.主要要素 1.主从句的位置 3.时态呼应
if “如果, 假如” 它引导的句子表示 “在…条件下,某事才能发生”,真实 条件句用于陈述语气,表示假设的条 件可能存在或发生。
3) 主句为祈使句,if从句用一般现在时态 (主祈从现)
1.You must stop if the traffic is red. 2.Don’t wait for me if I am late.
总结
If引导的真实条件句用法巧记忆:
从主有逗, 主从无逗; 主将从现, 主祈从现, 主情从现; 是否如果, 要分清楚。
2.If的两面性
三、练习巩固
二)选择
4. Please stay at home if it tomorrow. A. rains B. rained C. will rain D. rain
解析:if引导条件状语从句 ,主句放在从句之前,主句是祈使句,从句用 一般现在时,选A
5. I ____ her the answer if she ____me. A.am going to tell, asks B. will tell, asks C.am going to tell, ask D. will tell, ask
3.You may pass the exam if you study (study) hard.
解析: if 意为“如果”引导条件句,主情从现
3.时态呼应
will come 2.I want to know if he _________(come) tomorrow, comes if he _______(come), I __________(give) the will give massage to him.
三、练习巩固ຫໍສະໝຸດ 一)给所给词的适当形式填空stops 1.If the rain _______(stop) tonight, we will go to the cinema.
解析: if意为“是否”,引导条件句主将从现,所以从句为一般现在时
解析:第一空,if意为“是否”,引导宾语从句,时态为一般将来时;第二三空, if 意为“如果”引导条件句,主将从现