If引導(dǎo)的兩種從句賓語從句和條件狀語從句

1、If引導(dǎo)的兩種從句賓語從句和條件狀語從句It was last revised on January 2, 2021重點、難點1. 含有if引導(dǎo)的條件狀語從句的復(fù)合句中主從句的時態(tài)。2. If引導(dǎo)的賓語從句與條件狀語從句的區(qū)別?？记榉治鐾ǔＴ趩雾椷x擇、完形填空或補(bǔ)全、完成句子等題型中考查，分值約3分。知能提升(-)知識講解【認(rèn)知講解】Iif引導(dǎo)的賓語從句if引導(dǎo)賓語從句時，意思為：是否，從句的時態(tài)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兒。He asked me if I could help him.他問我是否能幫他

2、?！究疾辄c】if、whether引導(dǎo)的賓語從句的區(qū)別l.if或whether引導(dǎo)賓語從句時，作“是否"講，常放在動詞ask、sec、say、know和 findout等后面。一般情況下，兩者?？蓳Q用，在口語中多用if?！纠洹縉obody knows whether / if it will rain tomorrow.沒有人知道明天是否下雨。Lucy asked whether / if they had a cotton sweater. 露西問他們是否有棉制的毛衣。2.if或whether引導(dǎo)賓語從句時，要注意三個方面，即連詞、語序和時態(tài)。if或whether既不能和that或

3、其他連詞(副詞)同時使用，也不能省略?！纠洹课也恢浪裉焓欠駮?。誤I don't know that if(whether) he will come here today.正I don't know if(whether) he will come here today.他走過來看看貓是否出了毛病。誤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

4、.if或whether引導(dǎo)賓語從句時，雖具有疑問的意義，石其從句應(yīng)用陳述句的語序。 【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.老婦人問我是否知道去醫(yī)院的路。if或whether引導(dǎo)的賓語從句應(yīng)和主句的時態(tài)保持一致。即主句為一般現(xiàn)在時, 從句用任一種時態(tài)；主句為一般過去時，從句則用過去時中的任一種時態(tài)?！纠洹縄 don't know if (whether) he h

5、as come heru.我不知道他是否來過這兒。Tom asked if (whether) I had read the book湯姆問我是否看過這本書。3. 只能用whether的情況在動詞不定式之前只能用whether :【例句】I can't decide whether to stay.我不能決定是否留下。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。在介詞后，只能用whether :【例句】His father is worried about

6、 whether he loses his work.他的父親扌日心他是否會失去工作。用if會引起歧義時：【例句】Could you tell me if you know the answer這句話有兩種意思：“你能告訴我你是否知道答案嗎？”或“如果你知道答案，請告訴我，好嗎？如用whether則可避免歧義?！究碱}鏈接】I don't know they could pass the exam or not.A. why B. if C. that D. whether答案：D解題思路：本題考杳if與whether的區(qū)別，在whether.or not的固定搭配中通常只 用 whet

7、heroII. if引導(dǎo)的條件狀語從句1 含義條件狀語從句是在復(fù)合句中作條件狀語的句子。表示假如有從句的動作發(fā)生就會有主句的動作發(fā)生，條件狀語從句常由從屬連詞 if引導(dǎo)。【例句】You will catch the bus if you get up early.如果你早起的話，就能廷上:公共汽車。2.類別主祈從現(xiàn)：主句是祈使句從句是由曠引導(dǎo)的使用一般現(xiàn)在時的句子?！纠洹縄f you want to go, please tell me.如果你想去，請告訴我。Print the photo if you like it.如果你喜歡這照片就把它打印出來。主將從現(xiàn)：指if引導(dǎo)的條件狀語從句用一般

8、現(xiàn)在時，主句用一般將來時?！纠洹縄f it doesnt rain tomorrow, weTl go to the Great Wall.如果明天不下雨，我們就會去長城。If you don't get up early, you will be late for school. 如果你不早呂起床，你丄學(xué)就會遲到。3if引導(dǎo)的條件狀語從句用法：(1) 位置if引導(dǎo)的條件狀語從句，既可放在主句之前也可放在主句之后。當(dāng)從句置于主句之 前時，常用逗號與主句隔開?！纠洹縔ou will catch the bus if you get up early=If you get up ear

9、ly, you will catch the bus. 如東你阜起的話，競能趕上公共汽車。(2) 時態(tài)應(yīng)遵循主、從句時態(tài)呼應(yīng)的原則。當(dāng)主句是一般現(xiàn)在時(包含祈使句和含情態(tài)動詞can, may, must等的句子)，從句 也用一般現(xiàn)在時?！纠洹縔ou must see the doctor if you are ill.如果你生病了，你必須去看醫(yī)生。If you want to go skating, wear warm clothes. 如果你想去溜冰，穿乍暖和的衣服。如果主句是一般將來時，從句必須用一般現(xiàn)在時。【例句】You will be late for school if you g

10、et up late.如果你起晚了，你上學(xué)將遲到。If it rains tomonow, we won go to the Gieat Wall.如果明天下雨，我們就不去長城了。(3) 在if引導(dǎo)的條件狀語從句中，當(dāng)主句是一般將來時時，不能使用be going to 結(jié)構(gòu)，而要用will?！纠洹縄T1 help you with your English if I am free tomoiTOW 如果明天我有空，我會幫肋你學(xué)英語。(4) 在if引導(dǎo)的條件狀語從句中不能使用some,而要用any。【例句】If you have any questions to ask. please co

11、me to my office如果你有問題要問的話，請到我辦公室來。(5) 同義句轉(zhuǎn)換if引導(dǎo)的條件狀語從句可轉(zhuǎn)換成簡單句，其方法如下：*借助"祈使句+and/or+簡單句”結(jié)構(gòu)。其中and表示句意順承，or表示句意轉(zhuǎn)折?！纠洹縄f you work hard, you，11 pass the exani=Work hard, and you'll pass the exam如果你努力學(xué)習(xí)，你就會通過考試。If you don't huny up, you41 be late.=Hurry up, or yoifll be latu如果你不快點，你將會遲到。*借助介

12、詞with或without來轉(zhuǎn)換：，【例句】If you help me, I'll finish my job soon.=With your help, Fll finish my job soon.如果你幫我，我將很快完成我的工作。If there is no water, fish may die.=Fish may die without water.如果沒有水，魚可能會死。另外，if從句還表示不可實現(xiàn)的條件或根本不可能存在的條件，即一種虛擬的條件 或假設(shè)。從句多用一般過去時或過去完成時，表示對現(xiàn)在或過去的一種假設(shè)?！纠洹縄f I were you, I would inv

13、ite him to the party .如果我是你，我會邀請他參加聚會。I would have arrived much earlier if I had not been caught in the traffic .要不是交通堵塞，我會來得更早一些。4. 口訣:if條件句不一般，幾個要點記心間；條件句，放在前，逗號要放句中間。條件句表可能，主句多用將來時；條件句表事實，主句常用現(xiàn)在時。III If引導(dǎo)的賓語從句和條件狀語從句的區(qū)別if引導(dǎo)條件狀語從句時意為“如果”，引導(dǎo)賓語從句時意為“是否”，可用whether替 換。【例句】1）We will go out if it is fin

14、e tomorrow.如果明天天好，我們就出去。2）I don't know if the train has arrived.我不知道火車是否已經(jīng)到達(dá)。句1）中if引導(dǎo)的是狀語從句。這個從句表示“條件"。句2）中if引導(dǎo)的是賓語從句，充當(dāng)謂語動詞doif t know的賓語?！究碱}鏈接】I don't knowhe will come tomonow.he comes, I'll tell you .A. if; WhetherB. whether; Whether C. if; ThatD. if; If答案：D解題思路:第一個空處為賓語從句的引導(dǎo)詞，用i

15、f、whether都可以；第二個空為 條件狀語從句的引導(dǎo)詞，需用if,綜合考慮，D項正確。（-）提分技巧1. 熟練掌握if引導(dǎo)的賓語從句與條件狀語從句的特點。2. 熟知if引導(dǎo)的賓語從句與條件狀語從句引導(dǎo)詞的區(qū)別。（三）即學(xué)即練I句型轉(zhuǎn)換1. Do they want fried chicken? He asked the boys.（改為賓語從句）He asked the boystheyfried chicken.2. Was the watch made in Shanghai I don,t know.（改為賓語從句）I don,t knowthe watchmade in Shang

16、hai.3. “Do you want to try something new'、Tom's mother asked him.(同義句轉(zhuǎn)換)Toms mother asked himto try somethine new.答案 :1 if / whether, wanted 2. if / whether, was 3. if / whether he wantedII. 用括號中所給動詞的適當(dāng)形式填空1 If it(not rain)tomorrow,(let) us go shopping2. Please(tell)me if you(go).3. If you(b

17、e)ill, you(have)to see the doctor.4. I(leave)for Beijing if it(not snow) this afternoon.答案:1 doesn't rain, let 2. tell, go 3. are, have 4. will leave, doesn't snowIII. 將下列句子翻譯成英語。1. 如果明天不下雨，我就和同學(xué)們?nèi)ヒ安汀?. 如3如果你想減肥(lose weight),就鍛煉身體吧。4如果冬天來了，春天還會遠(yuǎn)嗎？5如果可能的話，我就去火車站接你。答案:1. If it doesift rain tom

18、orrow, I will have a picnic with my classmates.2. I will go shopping on Sunday if you do.3. Take some exercise if you want to lose weight.4. If winter comes, can spring be far behind?5. If (it is) possible, Fll meet you at the ti aiii station.下學(xué)期期中復(fù)習(xí)(一)、預(yù)習(xí)新知Module 1-Module 5重點基礎(chǔ)知識二、預(yù)習(xí)點撥思考問題一：能否先把這5個

19、模塊的重點單詞、短語、語法整理一下？思考問題二：我們已經(jīng)學(xué)習(xí)了哪些語法哪些還是你比較薄弱的同穆糜7 （答題時間:45分鐘）、用所給動詞的適當(dāng)形式填空。1 If you(feel) tired, you(have) to have a rest.2. Wherehe(see) the film if he(have) time?3. If there(be) fewer trees, there(be) more pollution4. He(dress) more casually if he(not work) onweekends6. Lana(buy) a new dress if th

20、e old one(be) out of style.7. The twins(fight) if they(argue).8. I(have) a bake sale if I(need) money for education9. Peter(send) me a beautiful souvenir if he(tour)Spain 10. If Mr Green(say) I am hard working, my parents(feel) glad(go) to the beach if it(not rain) this week12. they(have) a match if

21、 the teacher(be) busy?13. He(write) a letter to his grandparents if he(get) his report card this week14. If she(get) up late, she(not catch) the early bus.15. Peter(major) in English if he(pass) the exams in Peking University.二、完成句子(每空一詞)。1 如果你要過馬路，不要亂跑。around if you cross the road2. 明天如果下雨的話，莪們將呆在家

22、里。Weat home if ittomorrow3. 如果你能說好英語的話，你就可以容易地與外國人交談。If you canEnglish well, youforeigners easily4. 如果你對別人好，們也會對你好。If youre nice to people, theyto you, too.5. 如果學(xué)生不對考試如此扌日心的話，他們會更開心的。If students don't worry about exams so much, they6. 他如果電視看太多了，他的父母會不高興。If heTV too much, his parentsunhappy.7. 如果

23、我們?yōu)樗M織生曰聚會，大家都會來的。Everyoneif wea birthday partyhim.&如菓明天不下雨，我會和你一起去公園的。If ittomorrow, Igo to the parkyou.9. 如果他有空，他會幫肋你的。If he、heyou.10. 如果Tom考試不及格，他就沒有機(jī)會上高中了。Tomhave theto go to the senior high school if hethe exams.三、同義句轉(zhuǎn)換。1 Study hard, or you won，t pass the examIf you study hard, youthe exam2

24、. Take a taxi, and youTl catch the train.youa taxi, you'll catch the tiaiii.3. If you go to bed early, you won't feel tii-ed in the morningearly,you won't feel tired in the morning.4. If you don't work hard, your teacher will probably be angiy.your teacher will probably be angry.5. B

25、reathe deeply for one minute, and you'll feel relaxed四、閱讀下面的廣告,然后用.will./的句式回答問題。youdeeply for one minute, yourelaxed.Travel BrochureCheap Cheap Cheap. Beijing for the weekend. 3D/2N. Book Now.Five Star HotelSave 50%Four Star HotelSave 40%Three Star HotelSave 30%Book before December 31st. Breakf

26、ast IncludedCity Tour 50RMB. Visit the Great Wall 100 RMB.1 How much will you save if you stay at the Four Star Hotel?2. How much will you save if you stay at the Three Star Hotel?3. What will happen if you book after December 31st?4. How much will you have to pay if you want to go on the City Tour?

27、5. How much will you have to pay if you want to visit the Great Wall?C. goD going2. It will be a long timePeterA. since, has finished B. after, finishes3. What will fatherus from Japanhis workC. when, will finish D before, finishesC. carrymakekites.B. to4. Weifang is famouskites.A. forB. toC. onD. w

28、ith5.1her the answer if shemeA. can tell, will ask B. will tell, will askC. would tell, askD. will tell,asks6. What are you going to do tomorrow?一We'll go to the libraiy tomonow if itA. isn，t rainB raindoesn't rain7. Do you know when he will come back tomorrow?C. won't rainA. comesB. wil

29、l comeC. comeD.may come& What will you do if youA. goD. will goto the old folks home visit?B. wentC. going9. If I eatfood, Pll be very fat.A. too manyB many tootoo10. Fll give the book to liim if liehere next Sunday.A. will comeB comesC is comingcame11 Therean English film in our school tomorrow

30、.A. is going to have B will haveC is going to be D. has12. Could you tell us whereA. 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, Ia bookA. readB am readingam going to read14. Whatyouwhen it began to rain?C. too muchD. inuchD.B. were, doingC. was readingD.A. do, dodid, do15. I'll wake you u