初中英语初一 if条件句
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的用法归纳总结
if的用法归纳总结if是英语中常用的一个连词,用于表达条件、假设或可能性。
它在句子中起到连接不同语义部分的作用,使得句子更加完整、清晰。
以下是对if的用法进行归纳总结:1. 表达现实条件:- if引导的主句表示现在或将来的真实条件,从句使用一般现在时态。
例:If it rains tomorrow, we will stay at home.- if引导的主句表示过去的真实条件,从句使用一般过去时态。
例:If she was tired yesterday, she went to bed early.2. 表达虚拟条件:- if引导的主句表示与事实相反的条件,从句使用过去完成时。
例:If I had studied harder, I would have passed the exam.- if引导的主句使用过去完成时,从句使用过去完成时进行的虚拟条件。
例:If he had arrived earlier, we would have caught the train.3. 表达将来可能性:- if引导的主句表示将来可能发生的条件,从句使用一般现在时态。
例:If it snows tomorrow, we will go skiing.4. 表达建议或要求:- if引导的主句表示建议或要求,从句使用一般现在时态。
例:If you have any questions, please ask.5. 表达假设:- if引导的主句表示假设,从句使用一般现在时态。
例:If I were you, I would apologize.6. 表达条件连词短语:- if引导的主句与从句之间有条件连词短语,从句使用一般现在时态。
例:If it is sunny tomorrow, we can go to the beach.7. 使用whether替代if:- 当表示是否的意思时,可以使用whether替代if。
初中英语:If引导的条件状语从句省公开课获奖课件说课比赛一等奖课件
_h_e_’_ll_p_la_y__b_a_s_k_e_tb__a.ll
Look and say
I will_e_a_t_s_o_m__e__fo_o_d__
if I’m hungry.
I will__h_a_v_e_a__r_e_s_t __
exercise.
if旳反义词:if...not...=unless,意思是:“假如不,除非”
I won’t go there unless I 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)
Look and say
__I _w_i_ll_s_e__e_a__d_o_c_t_o_r_ if I’m ill.
If I’m late, _I _w_i_ll__s_a_y_s__o_r_ry____.
位置:从句可放在主句之前或之后,但是放 在主句之前须有逗号隔开
If it rains tomorrow, I_w_i_l_l _w_a_t_c_h__T_V__a_t_h__o_m__e. I won’t__p_la__y_b_a__s_k_e_t_b_a_ll_.
I won’t go to the party_u__n__less I am invited.
变换:
1.有if引导旳条件状语从句旳复合句中,当主句和从句旳 主语均为you时,可转换为“祈使句,and+简朴句”或
“祈使句,or+简朴句” You can pass the exam if you work hard. Work hard ----------------,and you will pass the exam.
初中英语语法 If引导的条件状语从句(讲解及练习)
初中英语语法 If引导的条件状语从句(讲解及练习)初中英语语法-if引导的条件状语从句(讲解及练习)初中英语dd条件状语从句(讲解&练习)ⅰ条件状语从句的定义ⅱ条件状语从句的鼓励词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。
ifwepaymuchattentiontotheearth,we'llhaveabetterworld.如果我们多关爱地球,就会拥有一个更美好的世界ifitrainstomorrow,whatshallwedo?如果明天下雨,我们怎么办?特别注意:if还可以鼓励交互式条件句,则表示不容同时实现的条件,从句中多用通常过去时或过去顺利完成时。
whatwouldhappeniftherewerenowater?如果没有水会怎样?2.unless鼓励的条件状语从句,unless的意思就是如果不,除非。
可以与if...not 交换。
youwillfailinenglishunlessyouworkhard.你英语考试可以不及格的,除非你更加不懈努力。
3.as/solongas引导的条件状语从句:as/solongas意思是“只要”solongasyou'rehappy,iwillbehappy.只要你高兴,我就高兴。
ⅲ条件状语从句的种类ⅳ条件状语从句的时态原则条件句真实从句一般现在时一般过去时be动词用(were)用法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)。
②主句中含有情态动词,if从句用一般现在时态。
主句一般将来时情态动词+动原祈使句would/could+动原例句非真实wewillstayathomeifitrainstomorrow.如果明天下雨,我将要呆在家。
ifyoufinishyourhomework,youcangohomenow.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’tjumpintotheriverifyoufeelveryhot.如果你感到很热,不要跳入河里。
初中英语初一if条件句
if条件句【知识要点】定义:常见的if条件状语从句表示在某条件下,某事很可能发生,条件是可能存在的,主句中某种情况发生的概率也是很高的。
E.g. If you ask him,he will help you.如果你请他帮忙,他会帮你的。
E.g. 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。
E.g. 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,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,表示对现在或过去的一种假设。
E.g.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。
E.g.I would have arrived much earlier if I had not been caught in the traffic.要不是交通堵塞,我本会来得早一些。
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E.g. If he runs he’ll get there in time.如果他用跑的,他就会及时赶到那儿。
E.g. The cat will scratch you if you pull her tail.如果你拉猫的尾巴,它就会抓你。
2.if从句用一般现在时,主句用may/might/canE.g. If 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。
E.g. If it stops snowing we can go out.如果雪停了,我们就可以出去。
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。
初中英语If引导的条件状语从句(可编辑修改word版)
初中英语――if 引导的条件状语从句在if 引导的条件状语从句中,if 和条件句位置灵活,可直接放在主句后面,若if 条件句放句首,从句后面要加逗号,和主句隔开。
还要注意前后时态一致原则.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。
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。
三如果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。
初中英语语法之条件句讲解练习答案
条件句条件句(一)真实条件句二虚拟条件句虚拟语气表示一种假设的情况,或一种主观的愿望,即动词所表示的动作或状态并非事实,或不可能实现;英语虚拟语气的形式有下列几种:一、与现在事实相反如:If he had the time, John would make a trip to China to see the Great Wall.If I were you, I would give up drinking immediately立即、立刻.If I didn’t have a cold, I would go to your birthday party.二.与将来事实相反如:If you should lose, what would you doIf I were to see her tomorrow, I would tell her the truth.三、与过去事实相反如:If I’d known that it was going to rain, I would never have gone for a walk in the country.If I hadn’t had a cold last week, I wouldn’t have missed your birthday party.例题1. I don’t know if it ______tomorrow. If it ______,we won’t go on a picnic.A.rains;rainsB. will rain;rainsC. will rain;will rain2. In summer , food goes bad easily ________ it is put in the refrigerator.A. untilB. ifC. unless3. --I hear Jack Chan will come to Laiwu next week.--Really_______ he comes, my younger sister will be very happy,A.If B.Until C.Unless D.Before4. —Could we play football in your playground, Sir--No,_______ you have the principal’s note.5. Many children like fried chicken _______it is unhealthy food.6. All the students in Class 5 will climb the mountain if it _______ rain tomorrow.A. won’tB. don’tC. didn’tD. doesn’t7 ---Would you like to go bike riding with us tomorrow---Sure, ________ I am busy.A. sinceB. unlessC. whenD. until8. I don’t like bread. I won’t eat it ________ I am very hungry.A. whenB. unlessC. if9. You’d better look up the new word in a dictionary _____ you don’t know it.A. ifB. thatC. thoughD. whether10. After the meeting, we will have a party. If you _______ free, come and join us.A. areB. will beC. were练习1. I’ll go for a walk with you if it ________ tomorrow.A. won’t rainB. doesn’t rainC. will rainD. not rains2. I’m waiting for my Mum. ________, I’ll go shopping with her.A. If she doesn’t comeB. If she comesC. If she will comeD. If she won’t come3. ---Tommy, do you know if Frank ________ to the zoo this Sunday if it ________---Sorry, I have no idea.A. will go; is fineB. goes; is fineC. will go; is going to be fineD. goes; will be fine4. If I _______ you, I would wear the shirt and the tie.A. amB. wasC. wereD. will be5. What would you do if you _______ a lot of moneyA. hadB. have hadC. will haveD. have6. In Britain, you must be 18 ________ you want to drive a car.A. whyB. becauseC. soD. if7. If I _______ you, I’d take the small apple.A. amB. wereC. was8. Susan will not arrive at the airport on time _______ she hurries up.A. onceB. ifC. whenD. unless9. If my father ________ back, please let me know.A. comesB. will comeC. come10. Let’s see ___we can find some information about the city.A. thatB. ifC. whatD. whichA. was, would buyB. were, would like to buyC. were, would buyD. was, boughA. comeB. comesC. will comeD. cameA. winB. wonC. are going to winD. have won典型例题1B 2C3A4B5C6D7B;考查unless引导的条件状语从句;由关键词Sure可推断“我会和你们一起自行车旅行的,除非我很忙”,故排除A、C、D三项,选B;8B9A;考查if引导的条件状语从句;结合题意“如果你不知道那个新词,你最好在字典里查阅它”可排除B、C、D三项,选A;10A课后练习1B;在条件状语从句中,从句不能用一般将来时,应用一般现在时,故正确答案为B;2B3A;结合题意“汤姆,如果天气好的话,你知道弗兰克这个星期六将去动物园吗”可知第一个空是宾语从句,要用一般将来时,第二个空是条件状语从句,要用一般现在时,故排除B、C、D 三项,选A;4C5A;四个选项分别是动词have的四种形式,由关键词would和题意“如果你有很多钱,你会做什么”可知这里考查虚拟语气,故选A;6D7B;本题考查虚拟语气的用法;表示与现在事实相反的假设,条件状语从句中的be须用were;8D9A;考查条件状语从句的时态;因为主语是祈使句,所以从句要用一般现在时,故选A;10B 11C 12B 13B。
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。
初中英语if条件句
定义:常见的if条件状语从句表示在某条件下,某事很可能发生,条件是可能存在的,主句中某种情况发生的概率也是很高的。
E.g.Ifyouaskhim,hewillhelpyou.如果你请他帮忙,他会帮你的。
E.g.Ifyoufailintheexam,youwilllethimdown.如果你考试不及格,你会让他失望的。
E.g.Ifyouhavefinishedthehomework,youcangohome.如果你作业做完了就可以回家了。
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,表示对现在或过去的一种假设。
E.g.IfIwereyou,Iwouldinvitehimtotheparty.如果我是你,我会邀请他参加聚会。
E.g.IwouldhavearrivedmuchearlierifIhadnotbeencaughtinthetraffic.要不是交通堵塞,我本会来得早一些。
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E.g.Ifherunshe’llgetthereintime.如果他用跑的,他就会及时赶到那儿。
E.g.Thecatwillscratchyouifyoupullhertail.如果你拉猫的尾巴,它就会抓你。
2.if从句用一般现在时,主句用may/might/canE.g.Ifthefoggetsthickertheplanemay/mightbediverted.如果雾在大一些,飞机可能就会改在别的机场降落。
E.g.Ifitstopssnowingwecangoout.如果雪停了,我们就可以出去。
3.if从句用一般现在时,主句用must/shouldE.g.Ifyouwanttoloseweightyoumust/shouldeatlessbread.如果你想减肥,你必须少吃面包。
初中英语:If引导的条件状语从句
unless
变换:
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”
如果主句是祈使句,从句同样要用一般现在时。 Don’t go and play football if you don’t finish your homework. Please call me if he comes next Sunday.
练一练: 1。如果她早点儿起床,就有时间在家里吃早餐 If she____ ____a little earlier, she’ll have time to eat breakfast at home. 2。如果你参加聚会,你将会过得很开心。 If you____ the party ,you_____ ____ a great time. 3。如果明天下雨,我们将不去野餐 If it ____tomorrow, we ___ ____ for a picnic. 4。如果你经常听英文歌,你将会喜欢英语 If you often ____ ___English songs, you___ ___English.
Work hard
or
2. 借助介词with 或without来转换。 例如: If you help me, I’ll finish my job soon. ------------------, 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 ------------------. 如果没有水,鱼可能会死。
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if 引导的条件状语从句中,if 和条件句位置灵活,可直接放在主句后面,若if 条件句放句首,从句后面要加逗号,和主句隔开。
还要注意前后时态一致原则.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。
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。
三如果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.误区提醒if 既可以引导条件状语从句,表示“如果”,也可以引导宾语从句,表达“是否”。
if从句的三种用法
千里之行,始于足下。
if从句的三种用法if从句是英语语法中常见的一个句子结构,用于表示假设、条件或可能性。
依据具体的语境和意义,if从句有三种常见的用法:条件句、假设句和虚拟语气句。
下面将具体介绍这三种用法。
一、条件句(Conditional Sentences)条件句用于表示某种条件下的结果或后果。
它由if引导,分为三种类型:零条件句、一般条件句和虚拟条件句。
1. 零条件句(Zero Conditional Sentences)零条件句表示事实真实的条件和结果,表示的是普遍真理或状况。
它的结构通常是:if + 现在时,现在时。
例如:- If you heat ice, it melts.(假如加热冰,它会溶化。
)- If it rains, the ground gets wet.(假如下雨,地面会变湿。
)2. 一般条件句(First Conditional Sentences)一般条件句表示可能发生的条件和结果,表示的是将来可能发生的状况。
它的结构通常是:if + 现在时,将来时。
例如:- If it rains, I will stay at home.(假如下雨,我会呆在家里。
)3. 虚拟条件句(Second Conditional Sentences)虚拟条件句表示不太可能实现的条件和结果,表示的是与现实相反的状况。
它的结构通常是:if + 过去时,would + 动词原形。
第1页/共3页锲而不舍,金石可镂。
例如:- If I had a lot of money, I would travel around the world.(假如我有很多钱,我会环游世界。
)二、假设句(Suppositional Sentences)假设句用于表示假设、猜想或非真实状况。
它由if引导,通常是对将来可能的状况进行推想或假设。
1. 假如假设是可能的(Possible Condition)这种状况下,if从句和主句中的动词形式一般都使用现在时。
最新中考初中英语 if条件句 讲解及练习
中考初中英语if条件句讲解及练习【知识要点】定义:常见的if条件状语从句表示在某条件下,某事很可能发生,条件是可能存在的,主句中某种情况发生的概率也是很高的。
E.g. If you ask him,he will help you.如果你请他帮忙,他会帮你的。
E.g. 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。
E.g. 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,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,表示对现在或过去的一种假设。
E.g.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。
E.g.I would have arrived much earlier if I had not been caught in the traffic.要不是交通堵塞,我本会来得早一些。
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E.g. If he runs he’ll get there in time.如果他用跑的,他就会及时赶到那儿。
E.g. The cat will scratch you if you pull her tail.如果你拉猫的尾巴,它就会抓你。
2.if从句用一般现在时,主句用may/might/canE.g. If 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。
E.g. If it stops snowing we can go out.如果雪停了,我们就可以出去。
初中英语if条件状语从句
If you don’t eat now, you will be hungry later.
You will be hungry later if you don’t eat now.
If she doesn’t pay this bill today, she will run out of water tomorrow.
If a black cat walks towards you, it brings good fortune, but if it walks away, it takes the good luck with it.
If a friend gives you a knife, you should give him a coin, or your friendship will soon be broken.
They _______________ (travel)to Europeif they ________________ (win) that contest.
Second Conditional:
IF + PAST TENSE, WOULD +base form of a verb
If I watched TV at night, I wouldn’t sleep very well.
If it is cold,they die.
If you never say “please”,I put on my sunglasses.
If you don’t water the plants,I put on a coat.
初中英语语法——If引导的条件状语从句(讲解及练习)
初中英语――条件状语从句(讲解&练习)Ⅰ条件状语从句的定义Ⅱ条件状语从句的引导词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?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。
/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。
Ⅲ条件状语从句的种类Ⅳ条件状语从句的时态原则条件句 从句 主句 真实 一般现在时 一般将来时 情态动词+动原 祈使句 非真实 一般过去时 be 动词用(were ) would/could+动原注意:学习" if " 引导的条件状语从句的用法,现在总结一下: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。
条件句表真实,主将从现要遵从;条件句非真实,虚拟语气用到位。
练习Ⅰ.单项选择()you _____ to the party, you’ll have a great time.A. will goB. wentC. goD. going()2. I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks()3. – 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 rain()4. What will you do if you _____ to the o ld folk’s home?A. goB. wentC. goingD. will go()5.I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. cameⅡ.用所给词的适当形式填空6..If you ________(feel) tired, you _______________ (have) to have a rest.7. Where _______ he _________(see) the film if he ________________(have) time?8. If there __________(be) fewer trees, there _______________( be) more pollution.9. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot. 11. Lana ________________( buy) a new dress if the old one ____________(be) out of style.twins ______________(fight) if they_______________(argue).13. I ____________(have) a bake sale if I _____________(need) money for education.14. Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain.15. I ____________(go) to the beach if it________________ ( not rain) this week.17. __________they __________( have) a match if the . teacher _____________(be) busy?18. If she ____________(get) up late, she _____________ ( not catch) the early bus.Ⅲ.翻译下列句子19..如果他到的晚了会发生什么事情?What _______________ if he _____________ late?20. 如果努力学习,你就会取得好成绩。
(完整word版)初中英语If引导的条件状语从句.docx
初中英―― if 引的条件状从句在 if 引的条件状从句中, if 和条件句位置灵活,可直接放在主句后面,若 if 条件句放句首,从句后面要加逗号,和主句隔开。
要注意前后一致原 .引条件状从句的接主要有: if( 如果)、unless(除非)或 as long as(只要)等。
unless在意思上等于 if...not。
一、条件状从句用法1、引条件状从句最常用的是if, 由 if 引的条件状从句表示在某种条件下某事很可能生。
如:If you ask him, he will help you.如果你他帮忙 ,他会帮你的。
If you fail in the exam, you will let him down.如果你考不及格 ,你会他失望的。
另外 ,if 从句表示不可的条件或根本不可能存在的条件 ,也就是一种虚的条件或假 ,从句多用一般去或去完成。
如 :If I were you, I would invite him to the party.如果我是你 ,我会邀他参加聚会。
2、 unless = if...not. 除非 ,若不 ,除非在⋯⋯的候例如: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 ,比将照常行。
二、在条件状从句中,要注意“主将从”的定,即主句用一般将来,从句用一般在表示将来。
例句:I will come to see you if I have time.我有,我就来看你。
三如果 if 条件句的是重复生和示要生的情景和事件,主从句大多用一般在。
如:If bears are in danger ,they attack people.区提醒if 既可以引条件状从句,表示“如果”,也可以引从句,表达“是否”。
if的用法归纳总结
千里之行,始于足下。
if的用法归纳总结
if是英语中常用的条件句,用于表示假设、推理或条件等可能性的状况。
在句子中起到引导条件从句的作用。
if的用法格外机敏,可以用于各种句型和语境中。
下面将对if的用法进行归纳总结。
一、if引导的条件从句
1.基本条件句的结构:
假如主句用一般现在时,则条件从句用一般现在时;
假如主句用一般过去时,则条件从句用一般过去时;
假如主句用一般将来时,则条件从句用一般现在时。
例如:If it rains, we will stay home.(假如下雨,我们就会呆在家里。
)
If he had studied hard, he would have passed the exam.(假如他努力学习,他就会通过考试。
)
2.规律将来时:
若条件从句表示将来可能发生的事情,可以使用一般现在时;
表示对将来状况的推想,条件从句可使用\
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第五讲if条件句姓名:学校:年级:【学习目标】: 1. 了解if条件句,及其用法2. 通过读写训练,掌握if条件句的用法【知识要点】定义:常见的if条件状语从句表示在某条件下,某事很可能发生,条件是可能存在的,主句中某种情况发生的概率也是很高的。
E.g. If you ask him,he will help you.如果你请他帮忙,他会帮你的。
E.g. 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。
E.g. 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,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,表示对现在或过去的一种假设。
E.g.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。
E.g.I would have arrived much earlier if I had not been caught in the traffic.要不是交通堵塞,我本会来得早一些。
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E.g.If he runs he’ll get there in time.如果他用跑的,他就会及时赶到那儿。
E.g. The cat will scratch you if you pull her tail.如果你拉猫的尾巴,它就会抓你。
2.if从句用一般现在时,主句用may/might/canE.g. If 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。
E.g. If it stops snowing we can go out.如果雪停了,我们就可以出去。
3.if从句用一般现在时,主句用must/shouldE.g. 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。
4.if从句用一般现在时,主句用一般现在时E.g. If you heat ice it turns to water. (也可用will turn)如果把冰加热,它就会化成水。
5.if从句用现在进行时,主句用一般将来时E.g.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。
6.if从句用现在完成时,主句用一般将来时E.g.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注意:学习" if " 引导的条件状语从句的用法,现在总结一下: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。
在if 引导的条件状语从句中,如果从句谈论的是一个有可能发生的事实及其产生的相关的结果,主句用一般将来时态,从句用一般现在时态。
如:E.g. We can walk there if we can't find a bus .E.g. If it rains tomorrow ,we will not go to the zoo.E.g. What will you do if you find a panda in danger.如果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。
E.g. If bears are in danger ,they attack people.在if 引导的条件状语从句中,if 和条件句位置灵活,可直接放在主句后面,若if 条件句放句首,从句后面要加逗号,和主句隔开。
还要注意前后时态一致原则【经典练习】一.单项选择()1. If you _____ to the party, you’ll have a great time.A. will goB. wentC. goD. going()2. 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. make()4. Weifang is famous ______ kites.A. forB. toC. onD. with()5.I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks()6. – What are you going to do tomorrow?--We’ll go to the library tomorrow if it ___.A. isn’t ra inB. rainC. won’t rainD. doesn’t rain()7.—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 come()8. What will you do if you _____ to the old folk’s home visit?A. goB. wentC.goingD. will go()9. If I eat ____ food, I’ll be very fat.A. too manyB. many tooC. too muchD. much too()10. I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came()11. There ____an English film in our school tomorrow.A. is going to haveB. will haveC. is going to beD. has()12. 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 held1---5 CDBAD 6---12 DAACBCB二.在正确的答案下划一条线。
1. Daina ( will go/go/goes) to Europe if she (will pass/pass/passes) the exams .2. The graduates (will teach/teach/teaches) in the poor village if the Ministry of Education (will agree/ agree/agrees) soon.3. If there (will be/ are/is) a car accident, they (will call/call/calls) 110 for help at once.4. If it (won’t/don’t/doesn’t/ isn’t) rainy, we (will take/ take/takes) walk outside.5. If a UFO (will land/land/lands) in front of me, I (will go/go/goes) in to look for the alien.6. If he (will have/have/has) money, he (will bulid/build/builds) a science lab.7.Don’t wait for me if I (am/ will be) late.8.They (won’t/don’t) go to the beach if it (will rain/rain /rains).9. I (will call/ call) you if he (will stay/stay /stays) at home.10. Mr Smith (will let/ let/lets) you know if he (will need/ need/ needs) help.11. (Will / Do/ Does) h e visit the museum if he (won’t / don’t/ doesn’t) get tired?12. Where (will/ do/does) they live if they (will miss/ miss/ misses) the bus?三、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.7.The twins ______________(fight) if they_______________(argue).8. I ____________(have) a bake sale if I _____________(need) money for education.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.12. __________they __________( have) a match if the P.E. teacher _____________(be) busy?13.He ____(write) a letter to his grandparents if he ____(get) his report 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 Peking University.三.翻译句子1.如果他到的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。