If 用法汇总及练习

If用法汇总及练习

If 用法汇总1、主将从现（主句为一般将来时,从句为一般现在时）；eg:If it rains(从句) ,I will stay at home（主句）.=I will stay at home if it rains.2、主句含有情态动词（must、may、can etc.）从句为一般现在时；eg:If you drive too fast ,you may have an accident.=You may have an accident if you drive too fast3、主句为祈使句,从句要用一般现在时态；eg:Don't play computer games if you don't finish your homework. 4、是否=whetherAsk if he is at home. I wonder if she is ill.5、虚拟语气eg:If I were a bird ,I would fly in the sky.（事实我不可能是鸟）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从句用一般过去时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从句用过去完成时should(would) have+ 过去分词If she had worked harder,she would have succeeded.If my lawyer had been here last Saturday,he would have prevented me from going.c.表示对将来的假想一般过去时，were+ to do，从句：主+ should/would/could/might+v原形should+ v原形，If you succeeded,everything would be all right.If you were to succeed,everything would be all right.If you should succeed,everything would be all right.单项练习（每个必须让学生翻译）1. If I _____ where he lived, I _____ a note to him.A. know, would have sentB. had known, would have sentC. know, would sendD. knew, would have sent2.Mary is ill today. If she _____, she _____ absent from school.A. were not ill; wouldn’t beB. had been ill; wouldn’t have beenC. had been ill; should have beenD. hadn’t been ill; could be3. He acted as if he _____ everything in the world.A. knewB. knowsC. has knownD. won't know4. If you had enough money, what _____?A. will you buyB. would you buyC. would you have boughtD. will you have bought5. If Mr. Young _____ with justice, he _____ such a wrong thing.A. were treated; wouldn’t doB. had been treated; wouldn’t have doneC. were treated; wouldn’t have doneD. had been treated; wouldn’t do6. What _____ if there _____ no light during the day?A. will happen; wasB. would happen; isC. happens; wereD. would happen; were7. The spokesman acted that way as if he _____ anything about the accident but actually he did.A. doesn’t hearB. didn’t hearC. haven’t heardD. hadn’t heard8.If it _____ not for the fact that you _____ ill now, I would surely punish you.A. is; areB. were; wereC. were; areD. was; were9. Many Chinese movie stars now have given up their Chinese nationality. If I were them,I _____ that.A. shouldn’t doB. didn’t doC. hadn’t doneD. won’t do10. I want to get back by 5 o’clock if _____.A. likelyB. canC. possibleD. Probable11. It seems as if it _____ already summer now but it is only February.A. isB. wasC. wereD. had been12. If Henry had not pulled his cap low over his brow, he _____ by the police.A. might be recognizedB. might have been recognizedC. would have recognizedD. was to have been recognized13. There is a ring at the door. That _____ be the postman, I suppose.A. willB. wouldC. is going toD. was going to14. Look at the dark clouds—there _____ be a storm.A. willB. must have beenC. is going toD. would15. —Why are you taking the pictures down?—I _____ the wall.A. paintB. have just paintedC. am going to paintD. will have painted16. —Can I stay at home tomorrow?—Yes, you can if it_____.A. will snowB. is going to snowC. snowsD. snowed17. I don’t know if he _____ this afternoon. But if he _____, I will tell you.A. will come; will do;B. comes; will doC. will come; doesD. comes; does18. —I thought I asked you to fix the radio.—Oh, I’m sorry. I _____ it right away.A. am to doB. will doC. was about to doD. am going to do19. The WTO can’t live up to its name _____ it does not include a country that is home to one fifth of mankind.A. as long asB. whetherC. ifD. even though20. Ask him to ring me up if you _____ him.A. seeB. sawC. would seeD. will see21. It’s so late. I don’t think he ______ come.A. wouldB. shouldC. is going toD. shall22. If people _____ polluting the air, animals and plants will die soon.A. don’t stopB. didn’t stopC. shall not stopD. haven’t stopped23. If you _____ an interesting day out, ______ the Science Museum.A. want; visitingB. want; visitC. want to; visitD. wanting; visit24. If the pure water is heated to 100 centigrade degrees, it ______ boil.A. is going toB. willC. wouldD. is to25. Is a dictionary available, _____ so, where?A. ifB. if isC. and ifD. and if is1—5 BAABB 6—10 DDCAC11—15 CBACC 16—20 CCBCA 21—25 CABBC最后一练——1.If you _____ to the party, you’ll have a great time. A. will go B. went C. go D. 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. take B. bring C. carry D. make4. Weifang is famous ______ kites. A. for B. to C. on D. 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 visit?A. 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. has12. 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 read14.What ____ you ____ when it began to rain?A. 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 CDBAD 6---10 DAACB 11---15 CBCBC。

if句型的用法总结

if句型的用法总结1. if句型的基本用法if句型是英语中最常用的条件句句型之一，它用于描述一个条件成立时会发生什么样的结果。

基本的if句型结构为：if 条件:条件成立时执行的代码块在这个结构中，条件决定了是否执行代码块的部分。

如果条件成立，代码块将会被执行；如果条件不成立，则代码块将会被忽略。

2. if…else句型除了基本的if句型外，还有一个常见的变体——if…else句型。

它在条件成立时执行一个代码块，并在条件不成立时执行另一个代码块。

其结构如下：if 条件:条件成立时执行的代码块else:条件不成立时执行的代码块在if…else句型中，如果条件成立，将执行if代码块；否则，将执行else代码块。

3. if…elif…else句型在某些情况下，我们可能需要判断多个条件，并根据不同的条件执行不同的代码块。

这时，可以使用if…elif…else句型。

其结构如下：if 条件1:条件1成立时执行的代码块elif 条件2:条件2成立时执行的代码块elif 条件3:条件3成立时执行的代码块...else:条件都不成立时执行的代码块在if…elif…else句型中，只有当前面的条件不成立时才会判断后面的条件。

如果某个条件成立，将执行对应的代码块。

如果所有条件都不成立，将执行else代码块。

4. 嵌套if语句在某些情况下，我们可能需要在if代码块中再次使用if语句，这就是嵌套if语句。

嵌套if语句可以用于处理更复杂的条件判断。

例如：if 条件1:if 条件2:条件1和条件2同时成立时执行的代码块else:条件1成立，但条件2不成立时执行的代码块else:条件1不成立时执行的代码块在嵌套if语句中，内部的if语句只有在外部if语句的条件成立时才会被执行。

5. if语句的注意事项•条件表达式:–条件表达式应该是一个布尔表达式，即可以判断为真或假的表达式。

–可以使用比较运算符（如==、!=、<、>等）、逻辑运算符（如and、or等）以及其他返回布尔值的函数或表达式作为条件。

if的虚拟语气的用法例句

if的虚拟语气的用法例句一、if的虚拟语气简介虚拟语气是英语中一种特殊的语法现象，常用于表示假设情况、与实际情况相反的条件或无法实现的愿望等。

if引导的条件句中，根据其所表示的条件类型和时间性质，使用不同形式的虚拟语气。

二、与现在事实相反的虚拟语气1. 假设条件：如果+动词过去式（be动词用were）例句：If I were a bird, I would fly high in the sky.2. 假设条件：如果+动词过去完成时（had + 过去分词）例句：If he had studied harder, he would have passed the exam.三、与现在事实相反但可能实现的虚拟语气1. 假设条件：如果+动词过去式（be动词用were）结果：主将从现例句：If it rained tomorrow, I would stay at home.2. 假设条件：如果+动词过去完成时（had + 过去分词）结果：主将从现完成例句：If he had invited me, I would have gone to the party.四、与过去事实相反的虚拟语气1. 假设条件：如果+主语+had + 动词过去分词结果：主语+would/could/might + have + 过去分词例句：If I had known the truth, I would have made a different decision.2. 假设条件：如果+主语+had not +过去分词形式，结果也用一般过去时态例句：If we hadn't missed the train, we would have arrived on time.五、与将来事实相反的虚拟语气1. 假设条件：如果+动词过去式（be动词用were）结果：主将从现（应该+动词原形）例句：If they were here, they would help us.2. 假设条件：如果+should/were to/might/could/would + 动词原形结果：主将从现（应该+动词原形）例句：If he should call, please ask him to wait.六、虚拟语气中常用的连词和引导短语1. if: 引导条件状语从句，表示假设情况。

if条件句练习题及答案

if条件句练习题及答案一、选择题1. 如果明天不下雨，我们将去野餐。

A) If it doesn't rain tomorrow, we will go for a picnic.B) If it rains tomorrow, we will go for a picnic.C) If it will rain tomorrow, we will go for a picnic.D) If it rains tomorrow, we will not go for a picnic.2. 只有当我完成作业后，我才会看电视。

A) I will watch TV only after I finish my homework.B) I will watch TV only before I finish my homework.C) I will watch TV only while I finish my homework.D) I will not watch TV only after I finish my homework.3. 除非他道歉，否则我不会原谅他。

A) I will forgive him unless he apologizes.B) I will not forgive him unless he apologizes.C) I will forgive him if he does not apologize.D) I will not forgive him if he apologizes.4. 只要我们努力工作，我们就能成功。

A) We can succeed as long as we work hard.B) We can succeed unless we work hard.C) We can succeed if we do not work hard.D) We cannot succeed unless we work hard.5. 如果你饿了，冰箱里有食物。

if条件句练习题及答案

if条件句练习题及答案If条件句练习题及答案If条件句是英语语法中非常重要的一部分，它用来表达假设或条件。

以下是一些if条件句的练习题及答案，希望能帮助大家更好地掌握这一语法知识。

练习题一：用正确的if条件句填空。

1. If I __________ (have) enough money, I would buy a new car.2. If it __________ (rain) tomorrow, we will stay at home.3. If she __________ (study) harder, she would pass the exam.4. If he __________ (not be) late, we would have caught the train.答案：1. had2. rains3. studied4. had not been练习题二：选择正确的if条件句。

1. If I had studied harder, I __________ the exam.a) would have passedb) will passc) passd) passed2. If it rains tomorrow, we __________ our picnic.a) will cancelb) would cancelc) canceld) cancelled3. If you had told me earlier, I __________ helped you.a) willb) wouldc) would haved) had答案：1. a) would have passed2. a) will cancel3. c) would have练习题三：根据给定的情景写出合适的if条件句。

1. 你的朋友迟到了，你会怎么说？If you had left home earlier, you wouldn't have missed the bus.2. 你想和朋友一起去看电影，但天气可能会下雨，你会怎么说？ If it rains tomorrow, we will stay at home and watch a movie.3. 你没有通过考试，你会怎么安慰自己？If I had studied harder, I would have passed the exam.答案：1. If you had left home earlier, you wouldn't have missed the bus.2. If it rains tomorrow, we will stay at home and watch a movie.3. If I had studied harder, I would have passed the exam.希望以上练习题和答案能帮助大家更好地理解和掌握if条件句的用法。

if引导的条件状语从句讲解和练习(答案)

条件状语从句一、条件状语从句通常由if（如果）, unless（除非），as long as（只要）引导。

例如：If it rains tomorrow, we won’t go to the park. 如果明天下雨，我们就不去公园了。

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。

Our parents will be pleased with our performance as long as we try our best.小试牛刀：1、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.2、如果人人为保护环境做出贡献，世界将会变得更美好。

______ ______ ______ _____ _______ to protecting the environment, the world will become much more beautiful.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. =If you study hard, you will pass the exam.Hurry up, or you’ll be late. =If you don’t hurry up, 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思路解析：本句是“祈使句＋and”的句型，句意为“努力学习，你会很快赶上其他同学的”，and在句中表示承接关系，所以选C项。

干货：if的11种用法（中考、高考）

干货：if的11种用法（中考、高考）if的12种用法（中考、高考以及稍高些的…）1.主将从现的if：表示经常发生或总是如此——这是目前中考英语常考的条目此种情况下的if后接的从句使用一般现在时或现在完成时，主句可以使用表示将来时的will, shall, can, must等情态动词，也可使用祈使句，be to do等结构。

1）We’ll go if the weather stays fine, but if it rains we’ll stay at home.2）I’ll go there, if I can find time.3）If anyone calls, tell them I’m not at home.4）If I don’t run, the train will have left. 如果我不跑，火车就会开走了。

5）If I’m going to a club, I wear much the same as I w ear for work.去俱乐部的话，我得和上班穿得差不多。

6） Should anyone call (= if anyone calls), please tell them I’m busy. （本条目以前发过）如果有人打电话来，请告诉他我正忙着。

If I stay till May, I’ll have been working here for 20 years.如果我待到5月，我在这儿工作就满20年了。

2.客观事实的if：总会这样，一般规则，客观真理，此时的if相当于when, whenever, every time，表示时间的含义。

（中高考英语不作为考查条目，需要平时了解）Accidents will happen. 意外总是难免的。

If metals gets hot it expands. 金属受热就膨胀。

Plastic will melt if it gets too hot. 塑料太热会融化。

if引导的条件状语从句知识点及练习题

if引导的条件状语从句一）定义if 引导的句子在复合句中表示条件，假如if 从句的动作发生，主句的动作就（不）会发生，因此称为条件状语从句。

二）位置if 引导的条件状语从句位置灵活，可直接放在主句后面，也可以放在句首。

放在句首时，从句后面要用逗号和主句隔开。

① If I have enough money, I will travel around the world.② I will travel around the world if I have enough money.① Work hard, and you'll pass the exam easily. 努力学习，你将很容易通过考试。

→If you work hard, you'll pass the exam easily.② Hurry up, or you'll miss the train. 快点儿，否则你就赶不上火车了。

→If you don't hurry up, you'll miss the train.（ 3 ）当主句含有情态动词时，if 引导的条件状语从句通常用一般现在时。

We must study hard if we want to pass the final exam. 如果想通过期末考试，我们必须努力学习。

（4）用含介词with 或without 的介词短语转换。

① If you help me, I'll finish my job soon.→With your help, I'll finish my job soon. 如果你帮我，我将很快完成我的工作。

② If there is no water, fish can't live.→ Fish can't live without water. 离开水，鱼不能生存。

四）if引导的条件状语从句与if引导的宾语从句的区别if 引导宾语从句时表示“ 是否” ，位于及物动词之后；if 引导的条件状语从句时表示“假如，如果” ，位于句首或句中。

If条件句练习附答案

If条件句练习:一．用if连接下列句子：1.It rains tomorrow.We won’t go for a picnic.If it rains tomorrow, we won’t go for a picnic.2.The children come home early.They will play in the garden. If the children come home early, they will play in the garden.3.He has a lot of money.He will buy a new car.If he has a lot of money,he will buy a new car.4.I am free.I’ll come here.If I am free, I’ll come here.5.He is rich.He will live abroad.If he is rich, he will live abroad.二．翻译下列句子：1.如果你摔下来，你会伤到自己。

If you fall, you’ll hurt yourself.2.如果我错过了公交车，我就坐车租车。

If I miss the bus, I’ll take a taxi.3.如果你明天病了，你就别去上班了。

If you are sick tomorrow, don’t go to work.4.如果他有很多钱，他就坐飞机去纽约。

If he is rich, he’ll go to New York by plane.5.如果他们给你更多的钱，你会做什么？If they give you more money, what will you do?。

人教版中考英语语法知识点If+引导的条件句+练习

语法专题：条件状语从句（1）if条件句：有可能性结果发生的行动，在这些句子中，动词的时态是不同的，if 引导的条件状语从句中，主句用一般将来时态，从句用一般现在时态（主将从现）If it doesn’t rain（从句）, we’ll have a picnic tomorrow（主句）.We’ll have a picnic tomorrow, if it doesn’t rain.（if引导的从句可置前可置后）（2）主祈从现（祈使句+if+一般现在时态）Put up your hands if you have any questions to ask. 如果你们有问题问的话，请举手。

当主语是you时，if 引导的条件状语从句可以与”祈使句+and/ or +简单句”进行句型转换。

And 表示句意顺承，or 表示转折，意为”否则”。

Take care , or you will fall off the tree. = If you don’t take care, you’ll fall off the tree. 小心，否则你会从树上掉下来。

（3）主情从现（情态动词+if +一般现在时态）If I get there early, I can see the doctor quickly.（4）句型：will do式be going to do式肯定从句If主语+动词+其他, 主语+will(won’t) do+其他. If主语+动词+其他, 主语+be(be not) going to do+其他.否定从句If主语+be+not+其他, 主语+will(won’t) do+其他. If主语+be+not+其他, 主语+be(be not) going to do+其他.If主语+don't/ doesn't +动词原形+其他, 主语+will(won’t) do+其他. If主语+don't/ doesn't +动词原形+其他, 主语+be(be not) going to do+其他.If the picture is silly, strange and colourful, you will remember it better.If I have time, I am going to visite you .I will go to the park if it doesn’t rain tomorrow . I won't go to the park if it rains tomorrow.专题精讲实战演练题型1：单项选择( ) 1. If the robot ___________ wrong，you can get a new one for free or get all your money back.A. wentB. goesC. would goD. will go ( ) 2. —We’ll go for a picnic if it ___________ on Sunday.—Wish you a lovely weekend.A. rainB. doesn’t rainC. won’t rainD. rains ( ) 3. I’ll do it better if the teacher ___________ me another chance.A. giveB. givesC. gaveD. will give( ) 4. If a polar bear ___________, it ___________ fish from the waterA. will be hungry；catchesB. is hungry；will catchB. is going to be hungry；catches D. is hungry；won’t catch( ) 5. If our government ___________ attention to controlling 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 be( ) 6. We will go for a picnic if it___________ tomorrow.A. doesn’t rainB. wasn’t rainyC. won’t rainD. wasn’t raining( ) 7. If the pure water is heated to 100 centigrade degrees, it___________ boil.A. is going toB. willC. wouldD. is to ( ) 8. She will go to America___________ she has much free time and money.A. as long asB. butC. thoughD. although( ) 9. We will go to the West Lake___________ it doesn’t rain heavily tomorrow.A. ifB. unlessC. as long asD. once ( ) 10. I won’t call you, ___________ something unexpected happens.A. unlessB. whetherC. becauseD. While Keys: 1-5 BBBBD 6-10ABAAA题型2：以所给词的正确形式填空1. If he ________ (study) hard, he will get good grades.2. Everyone must wear uniforms. If you don't, they ___________ (let) you in.3. If you stand at the top of the mountain, you _________ (see) the view of the whole city.4. My grandfather will wear a pair of glasses if he__________ (read) newspapers.5. Please turn off the light if you ________ (leave) the classroom.6. We’ll go for a picnic unless it ________(rain) this Sunday.7. Mr Smith ________ (let) you know if he needs help.8. If you walk along the street, you ________ (see) many foreigners.9. If Mary ________ (ask) me for help，I will try my best to help her.10. I don't know if it will snow tomorrow. If it_______ (snow)，we'll make snowmen. Keys:1. Studies 2.won’t let 3. will see 4. reads 5.leave6.doesn’t rain7.will let8.will see9. asks 10.snows直击中考题型1：单项选择( ) 1.—I wonder if your wife ________ to the party.—If your wife _________, so will mine.A. will go, goB. will go, goesC. goes, will goD. will go, will go ( ) 2. If he _________ in half an hour, we _________ wait for him.A. won't come, won'tB. won't come, don'tC. doesn't come, won'tD. will come, don't ( ) 3. I will send you an e-mail as soon as I_________ in Canada.A. arriveB. arrivedC. am arrivingD. will arrive( ) 4. If there ________ no buying and selling of animals, there _________ no killing in nature.A. is; will beB. will be; will beC. is; isD. will be; is ( ) 5. You can’t watch TV ________ you finish your homework.A. beforeB. ifC. whileD. asKeys:1-5:ACAAA。

if条件状语从句讲解与练习

if引导的条件状语从句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。

如：Please call me if he comes next Sunday.Can you call the policeman if you are in the trouble.注意宾语从句中的if与条件状语从句if的区别。

宾语从句中的if“是否”相当于whether，引导宾语从句，时态需根据语境确定。

如果主句用一般现在时，从句可以根据具体情况选用时态，如果主句用一般过去时，从句必须用过去式的某种形式。

I don't know if it will rain tomorrow. 我不知道明天是否会下雨。

Our teacher said there was going to be a football match the next month.我们说下月将有场足球比赛。

【边学边做】用括号内所给词的正确形式填空。

1. What will you buy if you ________（have）a lot of money?2. If it __________（not snow）tomorrow, we will feel unhappy.3. You mustn’t go to school if you ________（be）still in bed.4. If he _______（be）at home at that time, he would know it.5. Please show me the way if you ________（know）it.6. You will hurt your teeth if you ________（eat）too much candy.7. If you gave me a toy car, I _________（be）very happy.8. I would get the prize if I _________（work）hard.9．If she ______ (finish ) work early ,she ______(go) home.10．If the weather______（be）fine，we_______(go)for a walk .11. If I_____(have) time tonight ,I _______(finish) the book I’m reading.12. If it ______(rain) next weekend , we_______(not be able to ) plant the vegetable .13. If it_______(rain),we______(stay) at home .14.If she______(arrive) ,she _____(phone) me .15. If he_____(call),tell him I’ll ring back .if 条件状语从句的时态练习一．在正确的答案下划一条线。

if的用法总结及例句PPT

与“in case”的联系
in case可引导目的状语从句，相当于if引导的条件状语从句。例如：“Take an umbrella in case it rains.”（带把伞以防下雨。）
熟练运用if在固定短语和句型中应用
“If only”句型
表示对现在或将来的虚拟假设，通常用于表达遗憾或愿望。例如：“If only I had more time, I could finish the project.”（要是我有更多的时间，我就能完成这个项目了。）
典型例句
01
If it rains tomorrow, we will stay at home.（如果明天下雨，我们就呆在家里。）
02
If I were you, I would take the job.（如果我是你，我就会接受这份工作。）
03
If he had known the answer, he would have told me.（如果他知道答案，他就会告诉我。）
功能
用于表达在某种条件下会产生的结果或采取的行动。
结构特点
01
if从句+主句
if引导的条件状语从句通常位于主句之前，由if引导，后面紧跟主句。
时态呼应
02
03
虚拟语气
if从句中的时态通常与主句中的时态相呼应，表达相应的假设条件。
在if引导的虚拟条件句中，从句和主句的时态往往采用虚拟语气，表达与事实相反的情况。
“As if/though”句型
引导方式状语从句，表示比喻或虚拟的情况。例如：“She speaks English as if she were a native speaker.”（她说英语就像以英语为母语的人一样。）

if用法详解(含练习和答案)

if用法详解(含练习和答案)If的用法一、if作为连词，引导条件状语从句，表示“假如”“如果”等。

在复合句中，如果主句使用将来时，则if引导的状语从句使用一般现在时。

例如：1.如果天不下雨，下周星期天我们将去公园。

2.如果你请求他，他将会帮助你。

二、if还可以引导让步状语从句。

这时if相当于“即使是”，“虽说”。

例如：1.虽然她很穷，但至少她还是诚实的。

2.即使我错了，那么你也不对。

3.虽然会花费我一下午的时间，我还是要做这件事。

三、if作为连词还可以引导宾语从句。

引导宾语从句时和whether意思相同。

例如：1.XXX问她是否喜欢它。

2.她问他们是否有一件棉织的。

四、用于虚拟语气中，if从句中使用过去式，表示不可能实现、大概不会实现或提出作为考虑的假定条件。

例如：1.假使你是只鸟，你便会飞了。

2.如果我向他借贷，他会答应吗？另外，if从句中使用过去完成式，表示过去未实现的条件（例如由于不可能实现或某人未能实行）。

例如：1.要是他们早些动身，他们便可及时到达了。

2.如果他们那时不动身，现在他们就不会在此地了。

人一样。

2.As if by magic，the XXX.)花儿一夜之间就像魔法一样开了。

其次，unless与if连用，表示“除非”的意思。

例如：1.Unless you work hard，you won’t succeed．(If you don’t work hard。

you won’t succeed.)除非你努力工作，否则你不会成功。

2.I won’t go unless you come with me．(If you don’t com e with me。

I won’t go.)除非你和我一起去，否则我不会去。

最后，suppose与if连用，表示“假设、设想”的意思。

例如：1.Suppose it rains tomorrow，what will you do。

(If it rains tomorrow。

if的三种用法及例句

“if”在英语中常常被使用，主要有三种用法。

1. 表示条件：这是“if”最常用的用法，用来表达条件。

例如：
* If it rains, we will stay at home. 如果下雨，我们就待在家里。

* If you want to go, please let me know. 如果你想去，请让我知道。

2. 表示假设：在这种情况下，“if”可以表示一种假设或者可能的情况。

例如：
* If he were here, he would help us. 如果他在，他会帮助我们的。

* If I were you, I would choose to go. 如果我是你，我会选择去。

3. 表示因果关系：在某些情况下，“if”可以用来表示因果关系。

例如：
* If you eat too much, you will get fat. 如果你吃太多，你会变胖的。

* If I had known, I would have come earlier. 如果我知道的话，我会早点来。

以上就是“if”的三种主要用法和相应的例句。

if引导的条件状语从句练习题

if引导的条件状语从句练习题条件状语从句是英语中非常重要的语法结构，它用来表达一个动作或状态的发生依赖于另一个条件的成立。

以下是一些练习题，帮助学生更好地理解和运用if引导的条件状语从句。

1. 填空题：- 如果明天下雨，我们就会取消野餐。

(If it ______ tomorrow, we will ______ the picnic.)2. 改错题：- 如果你努力学习，你会通过考试。

(If you study hard, you will pass the exam.) (正确)3. 翻译题：- 如果你明天有空，我们可以一起去看电影。

(If you are free tomorrow, we can go to the movies together.)4. 选择题：- I will go to the party if I ______ my work before 5 p.m.A) finishB) finishedC) will finishD) have finished5. 连词成句：- If / you / a ticket / buy / will / you / the concert / attend.(If you buy a ticket, you will attend the concert.)6. 完形填空：- I promise to help you with your homework ______ you ask me.A) ifB) unlessC) untilD) because7. 转换句子：- He will go to the beach if the weather is good.- The weather must be good for him to go to the beach.8. 情景对话填空：- A: What will you do if you win the lottery?B: If I win the lottery, I ______ travel around the world.(A) will(B) would(C) am going to(D) have been going to9. 写作练习：- 写一段对话，其中包含至少两个if引导的条件状语从句。

if状语从句例句

if状语从句例句“If 的例句大放送：让假设不再神秘！”“嘿，朋友们！If 这个单词啊，简直就是英语里的魔法词，能带着我们在各种假设的世界里畅游。

今天咱们就通过一堆例句，把它玩转！”基础例句：打好理解的地基1. If it rains tomorrow, I will stay at home. （要是明天下雨，我就待在家里。

）2. If you are hungry, have some snacks. （如果你饿了，就吃点零食。

）3. If she comes, please tell me. （如果她来，请告诉我。

）4. If he studies hard, he will pass the exam. （如果他努力学习，他会通过考试的。

）5. If I have enough money, I will buy a new car. （如果我有足够的钱，我就买辆新车。

）场景例句：拓展使用场合生活场景1. If my mom is in a bad mood, I will cook dinner for her. （要是我妈心情不好，我就给她做晚饭。

）2. If the kids are noisy, I can't concentrate. （如果孩子们太吵，我就没法集中注意力。

）职场场景1. If the client changes the requirements, we will have to redo the project. （如果客户改变要求，我们就得重新做这个项目。

）2. If the meeting is cancelled, we can have more time to prepare. （如果会议取消了，我们就能有更多时间准备。

）正式场合1. If the law is amended, it will have a significant impact on the industry. （如果法律被修订，它将对该行业产生重大影响。

if和else用法

if和else用法一、if的基本用法1. If it rains tomorrow, I'll stay at home. (如果明天下雨，我就待在家里。

)- 这是一个很简单的if用法，表达一种假设情况。

就像在生活中，天气就像一个不确定的因素，就像一场赌局。

如果老天决定下雨这个“牌”，那我就选择待在家里这个“应对策略”。

2. If you study hard, you can get good grades. (如果你努力学习，你就能取得好成绩。

)- 学习和成绩之间有着一种因果关系的假设。

你想想看，学习就像是爬山，努力就是你的登山鞋。

如果穿上这双好的登山鞋（努力学习），那你肯定能更快地爬到山顶（取得好成绩），不是吗？3. If hees late again, his boss will be really angry. (如果他再迟到，他的老板会非常生气的。

)- 在工作场景中，时间观念很重要。

他老是迟到就像一直往老板的怒火里添柴。

如果他继续这么做（再迟到），那老板的怒火（be angry）就会像火山爆发一样，多可怕呀！4. If I see her, I might tell her the truth. (如果我看到她，我可能会告诉她真相。

)- 这里有一点犹豫的情绪。

看到她就像是一个触发点，就像打开一个装满秘密的盒子的钥匙。

如果这把钥匙（看到她）出现了，那我就可能会把盒子里的真相拿出来（告诉她真相）。

5. If they don't invite us, we won't go to the party. (如果他们不邀请我们，我们就不会去参加聚会。

)- 聚会邀请是一种社交礼仪。

他们不邀请我们就像是把我们关在聚会的大门之外。

如果他们这么做（不邀请），那我们也不会厚着脸皮去撞门（去参加聚会）。

6. If the dog barks, it may be because there's a stranger outside. (如果狗叫了，可能是因为外面有陌生人。

if真实条件句语法及练习

一．一般现在时1. 1含be动词的一般现在时1.含义：表示一般性，经常性的动作或一般性事实。

2.谓语动词的构成：am / is / are3.句型：1). 肯定句：主语＋be动词＋其他。

注意：①句子的第一个单词的首字母大写; ②句末加实心点。

2). 否定句：主语＋be动词＋not ＋其他。

注意：①句子的第一个单词的首字母大写; ②在be动词后面加not ; ③句末加实心点。

3). 一般疑问句：Be动词＋主语＋其他？注意：①把be动词提前; ②句子的第一个单词的首字母大写; ③第一人称改为第二人称;④句末加问号。

肯定回答：Yes, 主语＋be 动词。

否定回答：No, 主语＋be 动词＋not.4).特殊疑问句：特殊疑问词＋一般疑问句？1.2含实义动词的一般现在时1.含义：①表示现在的事实或状态②表示现在的习惯或反复的动作2.谓语动词的构成：do/does3.动词的第三人称单数形式的变化形式（动词的适当形式）①一般情况下，直接在动词后面加s。

例：want - wants②以s,x,sh,ch,o结尾的动词，加es。

例：wash - washes ; go - goes; do - does③以辅音字母加y结尾的动词，变y为i再加es。

例：try - tries4.句型：肯定句: 主语＋动词原形＋其他。

（主语非三单）主语＋动词的适当形式＋其他。

（主语是三单）否定句: 主语＋do＋not＋动词原形＋其他。

（主语非三单）主语＋does＋not＋动词原形＋其他。

（主语是三单）一般疑问句：Do＋主语＋动词原形＋其他？（主语非三单）肯定回答:Yes, 主语＋do. 否定回答:No, 主语+do+not.Does＋主语＋动词原形＋其他？（主语是三单）肯定回答：Yes,主语+does. 否定回答: No, 主语＋does＋not.特殊疑问句：特殊疑问词＋一般疑问句？二、一般将来时2.1 Be going to 句型1.含义：①打算要做某事②准备做某事2.谓语动词的构成：be going to + V原3.句型：①肯定句：主语+ be going to + V原+ 其他。