If引导的条件状语从句
初中英语——If引导的条件状语从句
初中英语――if引导的条件状语从句在主从复合句中修饰主句中的动词、形容词、副词等的从句叫做状语从句，状语从句一般可分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、结果状语从句、条件状语从句、让步状语从句、比较状语从句和方式状语从句九种。
在句子中做条件状语的从句称为条件状语从句。
可置于句首、句尾，有时还可置于主语和谓语之间。
引导条件状语从句的连接词有：if ,unless,as/so long as等1.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 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？注意：if还可以引导虚拟条件句，表示不可实现的条件，从句中多用一般过去时或过去完成时。
What would happen if there were no water ? 如果没有水会怎样？2.unless引导的条件状语从句unless的意思是如果不，除非。
可与if...not互换。
You will fail in English unless you work hard. 你英语考试会不及格的，除非你更加努力。
3.as /so long as引导的条件状语从句as /so long as意思是“只要”So long as you're happy,i will be happy. 只要你高兴，我就高兴。
4.once引导的条件状语从句once引导的条件状语从句，意为“一旦...，就”，从句可置于主句前或后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。
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需要遵循主过从过、主将从现的原则。
例如，如果明天下雨，我就不会去爬山。
如果明天不下雨，我就会和朋友去乡村。
如果你帮我，我就能按时完成。
如果明天天气好，我们可能会出去。
如果你完成了作业，你就可以看电视。
如果你下周日去购物，请给我打电话。
如果我去那里，我会给她带些花。
如果明天下雨，我们会待在家里。
如果他在家，请给我打电话。
如果你更加努力，你就能通过考试。
如果她明天有时间，她会去看望她的爷爷。
如果火车没有准时到达，我们会坐出租车去市区。
如果老师迟到了，他会生气。
除此之外，如果否定形式的if可以转换成肯定形式的unless，例如你如果不努力，你就不能通过考试，可以转换成你除非努力，否则你就不能通过考试。
With your help。
I will be ___.If you wake up early。
you will arrive on time.Wake up early。
or you will be late.If you wake up early。
you won't be late for school.Wake up early。
and you will catch the early bus.1.I will tell you about your friend.Answer: A。
come2.If you go to college。
you will get a good ___. Answer: A。
will get3.I want to know if they will come tomorrow. Answer: B。
will come4.___ exercise。
and you'll be in good health. Answer: D。
and5.If it doesn't rain。
he will play ___.Answer: If it doesn't rain。
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
--We’ll go to the library tomorrow if it __D_.
A. isn’t rain B. rain C. won’t rain D.will you do if you _____Ato the old folk’s
home visit?
2． I ____ her the answer if she ____me. A.can Dtell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks
3. – What are you going to do tomorrow?
If 引导条件状语从句的时态为一般现在时
记住“主将从现”
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----Sam, do you know if Alice ____to my party next week?
----I think she will come if she ____ free.
A comes; is B will come; will be C will come; is D comes; will be
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
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1. Can you tell me if she can come to the meeting ?
2. She will not go there if it is rainy tomorrow.
3. I can’t guess if she will be angry . 4. If we help each other , we both will get
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
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You won’t pass the exam if you don’t work hard.=You won’t pass the exam unless you work hard.If you don’t go to bed earlier,you will feel tired in the morning. =Unless you go to bed earlier,you will feel tired in the morning. If it doesn’t rain,he will play with me tomorrow.=Unless it rains,he will play with me tomorrow.If she doesn’t come,I’ll go shopping alone=Unless she comes,I’ll go shopping alone.if条件状语从句与祈使句,and/or＋一般将来时的句子转化If you get up early,you’ll get there on time.=Get up early,and you’ll get there on time.=Get up early,or you won’t get there on time.If you get up early，you won't be late for school.=Get up early，and you won't be late for school.=Get up early，or you will be late for school.If you don’t get up early,you won’t catch up with the early bus. =Get up early,and you will catch up with the early bus.=Get up early,or you won’t catch up with the early bus.if条件状语从句与without的句子转化If there is no water,we can't live.=We can't live without water.If there is no water,fish will die.=Fish will die without water.If you help me,I’l l finish the work soon.=With your help,I finish the work soon.if条件状语从句与祈使句,and/or＋一般将来时的句子转化If you get up early,you’ll get there on time.=Get up early,and you’ll get there on time.=Get up early,or you won’t get there on time.If you get up early，you won't be late for school.=Get up early，and you won't be late for school.=Get up early，or you will be late for school.If you don’t get up early,you won’t catch up with the early bus.=Get up early,and you will catch up with the early bus.=Get up early,or you won’t catch up with the early bus.1. your friend ,I'll tell you.eB.will comeesD.are coming2. If you go to college，you a good education.A.will getB.getC.getsD.got3.I want to know if they tomorrow.eB.will come C comes D.came4.Take enough exercise, you'll be in good heath.A.orB.soC.butD.and5.If it (not rain),he (play)basketball withme tomorrow.6.If Uncle Lan ______(come),I______(call)you up.7.She must see a dentist if she______(have)a toothache.8.Please wake me up if he______(come)back.9.Hurry up！Or you ______(be)late again.10.If you don’t be quick,you(be)late.1.We won’t wait for you you can’t arrive on time.A.untilB.whenC.afterD.if2.The children will go to the zoo if it (not rain)this Saturday.3.If she work hard,she be able to go to colleage.A.not,notB.won’t,won’tC.won’t,doesn’tD.dpesn’t,won’t4.If I run every day,I (be)healthier.5.If it (not rain),he (play)with me tomorrow.6.She must see a dentist if she (have)a toothache.7.Study hard,or you (not pass)the test.8.If you (not go)to bed earlier,you will feel tired in the morning.9.If he (be)free tomorrow,he will come to your birthday party.10.We will go to the zoo if it (not snow)tomorrow.。
If引导的条件状语从句
5. If you __d_o_n_’_t _w_o_rk___(not work ) hard , you _w_o_n_’_t _p_as_s_(not pass) the exam.
6. If she __m__e_n_d_s_(mend) the computer , her father __w_o_n_’t_b_l_am__e_(not blame ).
1.有if引导的条件状语从句的复合句中，当主句和从句的 主语均为you时，可转换为“祈使句，and+简单句”或
“祈使句，or+简单句” You can pass the exam if you work hard. Work hard ----------------，and you will pass the exam.
If you don't hurry up,you will be late again.
or Hurry up,------ you will be late again.
2. 借助介词with 或without来转换。
例如: If you help me, I’ll finish my job soon.
If引导的条件状语从句
潘店镇中学
if引导的条件状语从句
例句：If people obey the traffic rules, →从句 there will be fewer accidents. →主句
if:从属连词，意思是：“如果，假如，倘若”
： 结构
if引导的条件状语从句既可以放在句子前， 也可以放在句子后。
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
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If引导的条件状语从句
在复合句中，由从句表示的状语叫做状语从句。
从句由连接词if或unless=
(if not)引导的状语从句叫做条件状语从句。
条件状语从句最常用的连词是if（if是从属连词，译成：如果，假如，倘若）,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。
例句：If people obey the traffic rules, ➜从句
there will be fewer accidents. ➜主句
结构：if引导的条件状语从句，既可以放在主句之前也可以放在主句后。
（放在主句前时，要用逗号隔开。
）
原句可改为：There will be fewer accidents if people obey the traffic rules.
主将从现，主情从现，主祈从现，
If it rains tomorrow, I will stay at home.
If you are hard-working, your parents may feel happy.
Study hard, if she wants to get good grades.
If引导的条件状语从句和宾语从句的区分：（if的含义不同）
I.填空
1. I will watch TV every day. My mother will be angry.
If I ________TV every day, my mother _____ _____angry.
2. He will have a strange haircut. The teachers won’t agree.
If he _____ a strange haircut, the teachers______ _______.
II. 选择
1.If it rains tomorrow, we _____ visit the museum.
A. don’t do B .won’t go
C .aren’t go D. didn’t go.
2. Will you go to the park if it ____ fine?
A. will be
B. was
C. is D /
3. If you __to school late, your teacher _____ angry with you.
A. come; are
B. come, will be
C. will come; are
D. will come; will be
4. If you _____ hard, you will ___ successful.
A. work, are
B. works, is
C. to work, be
D. work, be
5. If I ____ too much TV, my mother will _______.
A .watch, angry
B .watched, be angry
C .watch, be angry
D .will watch, be angry
Ⅲ.翻译句子:
1.如果你起床晚了, 你就会上学迟到。
2 .如果你爱你的父母, 你应当帮他们做做家务。
3. 如果你更友善一些, 你会交上很多好朋友。