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’teg. 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 rainB. you will have , will rainC. you will have ,rainsD. will you have , rain( )2.We are not sure if it ____ tomorrow .If it ____ , our sports meeting will be put off .A. will rain , rainsB. rains , will rainC. 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 ,isB. will go ,will beC. goes , isD. 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。
if 引导的条件状语从句

一般现在时。 If you drive too fast, you may have an accident. You must stop if the traffic is red. If you finish the homework, you can go home. 如果你作业做完了就可以回家了。 If you want to lose weight you must/should eat less bread. 如果你想减肥,你必须少吃面包。
if引导的条件状语从句
If条件句:条件句用于陈述语气,表示将来的可能性,能力, 允
诺,命令,要求,请求,建议时,假设的情况可能发生,其中 if 是“假如, 如果”的意思。主句一般将来时 ,从句用一般现在时。
运用“主将从现”的原则。
构 成
条件从句
主句
时 态
If+一般现在时 主语+shall/will+动词原形
if引导的条件状语从句
主从句的时态?
If I get up late, I will be late for school. If I don’t finish my homework, I won’t go to bed. If you join the band(乐队), you will be famous.
• 除非天气不好,我每天早晨都要去散步。
• 3. I won‘t loan you unless you are in extreme need of money.
• 若不是你急需用钱,我不会借钱给你的。
if引导的条件状语从句
Summary(小结)
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, 主将从现不一般; 条件句表事实, 主句常用现在时。
If引导的条件状语从句

→主句谓语中也可以用had better(not)do,提建议 例句:如果你想减肥,你最好锻炼。
eg:If you want to lose weight,you had better take some
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exercise.
if的反义词:if...not...=unless,意思是:“如果不,除非”
W--i-t-h--y--o-u--r--h--e-l-p-, I’ll finish my job soon. 如果你帮我,我将很快完成我的工作。 If there is no water, fish may die.
Fish may die w--i-th--o--u-t--w--a--t-e-r--. 如果没有水,鱼可能会死。
I won’t go there unless பைடு நூலகம் hear from you.(同义句 if ) don’t
I won’t go there _____ I _____hear from you. I won’t go to the party if I am not invited. (同义句)
I will go out tomorrow if it doesn’t rain. = If it doesn’t rain, I will go out tomorrow.
If 引导的宾语从句放在主句之后;而if引 导的状语从句可放在主句之前也可放在主 句之后
If 引导的条件状语从句放于句首时多用逗号隔开;
时态:
if引导的条件状语从句, 主句用一般将来时(will),从句用一般现在时。
→主句谓语中也可以含有情态动词, 如:must,can,could,should等
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。
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“如果”的意思。
用法例句①主句为一般将来时态,if从句用一般现在时态(即主将从现)。
We will stay at home if it rains tomorrow.如果明天下雨,我将要呆在家。
②主句中含有情态动词,if从句用一般现在时态。
If you finish your homework, you can go home now. 如果你做完了作业,你现在可以回家了。
③主句为祈使句,if从句用一般现在时态。
Don’t jump into the river if you feel very hot. 如果你感到很热,不要跳入河里。
④主句为过去将来时,if从句用一般过去时态(如果涉及到be动词,一律都用were)。
此时,表达的是和现实相反的推测,用虚拟语气。
If I were you, I wouldn’t do it like that.如果我是你,我就不会那么做的。
If you gave me some money, I would be very happy. 如果你给我一些钱,我就会很高兴的。
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。
if 引导条件状语从句

if 引导条件状语从句【最新版】目录1.条件状语从句的定义和作用2.if 引导条件状语从句的用法3.实例分析4.注意事项正文一、条件状语从句的定义和作用条件状语从句是表示某种条件成立时,主句所表达的内容才会实现的从句。
它通常由连词 if 引导,用来表示在某种条件下,主句所述情况是否成立。
条件状语从句在英语中十分常见,具有很强的实用性。
二、if 引导条件状语从句的用法if 引导条件状语从句时,主句通常使用一般将来时,而从句则使用一般现在时。
这种时态搭配是为了表示在某种条件下,将来会发生的事情。
当然,在某些特殊情况下,也可以使用其他时态,例如主句使用一般现在时,从句使用一般将来时。
三、实例分析1.如果明天不下雨,我们会去公园。
(If it doesn"t rain tomorrow, we will go to the park.)在这个例子中,从句“it doesn"t rain tomorrow”表示一种条件,即明天不下雨,主句“we will go to the park”表示在这种条件下会发生的事情,即我们去公园。
2.如果你愿意,我们可以一起去看电影。
(If you are willing, we cango to the movies together.)在这个例子中,从句“you are willing”表示一种条件,即你愿意,主句“we can go to the movies together”表示在这种条件下会发生的事情,即我们一起去看电影。
四、注意事项在使用 if 引导条件状语从句时,需要注意以下几点:1.条件状语从句中的 if 通常可以翻译为“如果”,但有时也可以翻译为“是否”或“是不是”,具体翻译需要根据上下文判断。
2.条件状语从句中的时态搭配要正确,通常为主句一般将来时,从句一般现在时。
3.条件状语从句有时可以省略 if,直接用主句和从句连接,例如:It will be fine if it doesn"t rain.(如果下雨,天气就不会好了。
If引导的条件状语从句

1.If you __C___ to the party, you’ll have a great time.
A. will go B. went C. go D. going 2. I __D__ her the answer if she ____me.
A.can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks
11. If you ___a_re_____(be) happy , we will be happy .
12. If she translates (translate ) the sentence word by word , she __w_il_l _g_e_t_(get ) its true meaning .
2 If I ___c_o_p_y____(copy ) your homework , I will cheat myself .
3 If she ___d_o_e_s_n_’t_g_e_t____(not get ) up early , she’ll miss the early bus .
4 If your mother___b_u_ys__ (buy) the book for you , it will be good for your study.
• 例如: If you have any questions to ask, please come to my office. 如果你有问题要问的 话,请到我办公室来。
1. if 在句中的含义不同 I want to know if he is a teacher.
if条件状语从句

状语从句:用一个句子(从句)来作另一个句子(主句)的状语,用作状语的句子就叫作状语从句。
作什么样的状语就叫什么类型的状语从句。
例如:条件状语从句就是用一个句子来作条件状语。
状语从句的分类:(1)时间状语从句凡是从句都必须有引导词,引导时间状语从句的词有when,before,after,until,as soon as,while 等。
(2)条件状语从句主要看一下由if引导的条件状语从句。
if 意为“如果”,引导条件状语从句时,表示假如有从句的动作发生就(不)会有主句的动作发生。
例如:If it doesn't rain tomorrow,we will go there by bike.如果明天不下雨,我们就骑自行车去那里。
If I get there early,I can see the doctor quickly.如果我早早地到那里,我就可以快点看病。
3)地点状语从句用法要点常用where(哪里)和wherever(无论哪里)eg.Where there is a will,there is a way. 有志者,事竟成。
We will go wherever the motherland need us most. 我们要到祖国最需要的地方去。
(4)原因状语从句用法要点常用的引导连词有because,as和since,三者的区别是:在回答问题的时候,使用because;对于显而易见的原因,常用as或since;as和since的从句常放在主句之前,而because 的从句常放在主句之后。
eg.Why did you go?I went because Tom told me to go. 你为何去?那是因为汤姆叫我去。
He was angry not because we were late but because we made a noise.他很生气不是因为我们来迟了,而是因为我们弄出了声音。
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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 .专项练习:1. ______ my watch if your watch ______ . A. Look at ; isn’t workB. Look at ; doesn’t workC. Look ; worksD. Look ; doesn’t work2. Please get up early _____ you want to catch the first bus .A. orB. becauseC. andD. if3. ______ to lock the door if you _____ the last one to leave .A. Forget ; areB. Don’t forget ; will beC. Forget ; will beD. Don’t forget ; are4. If you _____ to stay healthy , ____ some exercise every day .A. want ; doB. wants ; doesC. will want ; doD. will want ; does5. _____ your mother the truth , if you don’t like it .A. T ell B. To tell C. Telling D. Tells6. If you have something important to tell us , _____ it right now ! A. speak B. talk C. tell D. say7. If you ______ to the music , buy a CD . A. will listen B. listenC. listeningD. listened8. Be careful if you ______ want to make mistakes . A. won’tB. don’tC. didn’tD. not9. If you ____ a chance to study in a foreign country , just take it .A. getting B. had got C. will get D. get10. All of us will be happy _____ you can come with us . A, while B. if C. but D. or11. If Mr. Smith ____back , please let me know . A. will comeB. comesC. comeD. had come12. I am waiting for my friend. _______ , I’ll swim alone .A. If he doesn’t comeB. If he won’t comeC. If he will comeD. If he is coming13. I’ll go to the zoo if it _____ tomorrow .A. doesn’t rain B. will rain C. rains D. won’t come14. If you___ another programme , ___ this button .A. choose ; pressB. chose ; pressC. chose ; to pressD. choose ; pressing15. Hurry up , _____ you’ll miss the last bus .A. orB. ifC. soD. then16. I won’t finish washing the dishes before 7:00 , ____ you _____ help me .A. unless ; /B. if ; don’tC. when ; /D. A or B17. --- ______ if he leaves school this afternoon ? ---- The teacher will punish him .A. What will happenB. What happensC. What happenedD. What is happening18. If he ____ again , you should report him to the police .A. stealB. stealsC. stoleD. stolen19. ____ it is sunny tomorrow, I’ll go hik ing with my son .A. WhenB. AfterC. IfD. Whether20. What should I do _____ the machine ______ ?A. if ; doesn’tworkB. whether ; doesn’t workC. unless ; workD. after ; work句型转换:(同义句转换1-5)1. If you don’t come home early , your parents will be angry ._______ _________ early , _____ your mother will be angry .2. If you keep studying , you may join us one day . ____ studying , ____ you may join us one day .3. We can’t finish the work on time if you don’t help us . We can’t finish the work on time _____ you help us .4. Be careful when you cross the street , or you will be in dangerous .Y ou will be in danger _____ you _______ careful when you cross the street .5. I won’t go to her birthday party if she doesn’t invite me .I won’t go to her birthday party ____ she _______ me ./ I will go to her birthday party _____ she _____ me .6. Y ou copy Tom’s homework . Y our teacher will punish you .(合并为一句)________________________________________________________________ ____7. The computer has a virus . The computer doesn’t work . (合并为一句)________________________________________________________________ ____适当形式填空:1. If she ______ ( run) every day , she will be much stronger .2. If you _____ ( be) late for school , your teacher _____ (be)angry .3. If Mary ______ (win)the prize , her parents will be proud of her .4. If Tom _____ ( not do ) it , his brother ______ (do) it .5. We _____ ( get) into trouble if the workers _______ ( not help ) us .6. Please _______ ( tell ) me if you _______(go).7. I _______ ( leave) for Beijing if it ________ ( not snow) this afternoon .8. If it _______(not rain)tomorrow , _____(let)us go shopping .9. If I get up late tomorrow , I _______ (be)late for school .10. Please bring your ID card . If you ______ (not bring) your ID card , you can’t go to the party .11. If he _____ (offer) to help mewith my English , I’ll be very happy .12. Mother told me if I ______ ( do) something wrong I should say sorry to her .13. If it ______ (snow) tomorrow , we’ll build a snowman .14. If somebody _______ ( wait) for you , you may go now .15. If he ______ (go) to the party , I _______ ( go) , too .16. Could you tell me if my father ______ ( arrive) home on time ?17. If my father _____ ( have) t ime tomorrow , he’ll take me to the zoo .18. _____(visit) the place if you _____ ( are ) interested in it .19. If you have a cold , _____ ( drink) water as much as possible .20. If you _____ ( not be ) happy , _______ ( try) ______( listen) to your favourite music .。