1、創 作人：歷恰面日 期：2020 年 1 月 1 日初三英語 Chapter4條件狀語從句知識精講創 作人：歷恰面日 期：2020年 1 月 1 日一.本周教學內容：Chapter 4條件狀語從句我們知道，引導條件狀語從句最常用的連詞是if ，由 if引導的條件狀語從句表示在某種條件下某事很可能發生。如：If you ask him, he will help you.假如你請他幫助，他會幫你的。If you fail in the exam, you will let him down. 假如你考試不及格，你會讓他絕望的。unless = if notLet's go out for

2、 a walk unless you are too tired.假如你不累的話讓我們出去走走。If you are not too tied, let's go out for a walk.假如你不太累讓我們出去走走。學習條件狀語從句應注意以下幾點：1條件狀語從句中一般不使用將來時態，盡管主句使用將來時態，而主句用一般如今時或者如今完成時。【例】2020 年 1 月 1 日創 作人：歷恰面日 期：創 作人：歷恰面日 期：2020 年 1 月 1 日I will come to see you if I have time.假如我有時間是，我就來看你。If the rain stop

3、s, I shall go out for a walk.假如雨停了，我就出去漫步。2注意條件狀語從句在虛擬語氣中的使用。【例】If I were to I should first of all get the experts to discuss the plan.假如我真的想做這事，我首先會找專家們討論我的方案。1表示與如今的情況相反，或者將來實現的可能性很小，if從句用過去式動詞be多用 were 這個形式，主句用“ would should could might 動詞原形。例如：If placesalike, there would be little need for geogr

4、aphers.A. beingB. areC. beD. were，答案是 D。在表示將來情況的虛擬條件句中，還可以用“were to不定式或者“ should 動詞原形。Jean doesn'twant towork rightaway because she thinksthatifshea job, she probably wouldn't be able to see her friends very often.A has to getB were to getC had gotD could have got， B 對2表示與過去的事實相反，從句用過去完成時，主句

5、用“would should could might have 過去分詞。如：創 作人：歷恰面日 期：2020 年 1 月 1 日If the policeman had arrived earlier, he would have seen the accident.要是警察更早些到達，他就能見到事故了。3注意假如以上兩類條件句中含有助動詞、情態動詞， be 或者 have,那么常常不用if ，而用倒裝構造： beforewe departthe day aftertomorrow,we shouldhave a wonderfuldinner party.AHad they arrived

6、BWould they arrive CWere they arrivingDWere they to arrive假如我們后天走之前他們到達的話，我們就舉行一次豐富的宴會。 97.1-34, D對3條件狀語從句中的略。【例】Come tomorrow if possible.可能的話，明天來。I will buy a DVD set if necessary.必要的話，我就買一臺DVD。那么，除了 if之外，是否還有其他連詞也可以引導條件狀語從句呢？答復是肯定的，不僅有，還有很多。這些詞由于出現的頻率較小，且用法較復雜一些，所以不如if為大家所熟知罷了。下面就這些詞的用法以例句的形式進展一下

7、簡單總結。1. unless conj.除非，假設不，除非在的時候You will fail to arrive there in time unless you start earlier.假如你不早點動身，你就不能及時趕到那兒。Unless it rains, the game will be played.除非下雨，比賽將照常進展。創 作人：歷恰面日 期：2020 年 1 月 1 日2. on conditionthat .在條件下，假如on conditionthat .引導的條件從句是主句事件發生的前提條件或者唯一條件。I can tell you the truth on cond

8、ition that you promise to keep a secret.我可以告訴你真相, 條件是你容許保守機密。You can go swimming on conditionthat you don't go too far from the river bank.你只有在不遠離河岸的條件下才可以下水游泳。3. supposing conj.假如 , 假設supposing引導的條件從句表示一種假設條件。Supposing it rains, shall we continue the sports meeting?倘假設下雨，我們的運動會還要繼續舉行嗎?Supposing

9、 something should go wrong, what would you do then?假設出了什么問題，你準備怎么對付?，除非，以為條件providedthat + 從句表示一種假設條件。He will sign the contract provided we offer more favorable terms.假如我們提出更優惠的條件，他就會在合同上簽字。He won't be against us in the meeting provided that we ask for his advice in advance.假如我們提早征求一下他的意見, 他就不會在

10、會上反對我們。從上述例句可以看出if ， unless ， on conditionthat ，supposing ， provided等詞引導的條件狀語從句，主從句條件關系清楚，構造明晰。但有些句子，雖沒有含條件關系的創 作人：歷恰面日 期：2020 年 1 月 1 日連詞，卻也隱含著條件關系，這些句子常用一些詞，如but for ， without等引出一個介詞構造來表示條件，條件常常是虛擬的，或者與事實相反的假設。如：but for假設非，要不是But for the rain, we should have a pleasant journey.要不是下雨，我們的旅行肯定會很愉快。Bu

11、t for your help, we should not have finished in time.要不是你幫助，我們肯定不能及時完成任務。agree to doHe agreed to go shopping with his wife although he hated it.agree toThe boss has agreed to my proposal.agree onThe boy and the girl agreed on the date of the following appointment.rememberI remember that I have given

12、 the book back to you.I remembered locking the door, but now the door is open. Though I am busy and tired I will remember to bring it for you.be essential to/for.Water is essential to the growth of crops.創 作人：歷恰面日 期：2020 年 1 月 1 日injureShe was badly injured in an accident.angrybe/get angry with sb.S

13、he was angry with her boyfriend. be angry at/about sth.She is always angry at the small things.imagineCan you imagine life without electricity?Imagine yourself to be rich and famous. He imagines that people don t believe him. Imagine doing a horrible job like that!amazingWhat an amazing film!connect

14、Will you connect this wire to the television? turn intoEnglish learning will turn into fun if you love it.turn sb./ sth. into.The war has turned him into a bloody killer.創 作人：歷恰面日 期：2020 年 1 月 1 日look uplook up sth.+介詞短語You can look up the new words in your dictionary. You can look it up on the map.

15、forget to do sth.Dont forget to feed the cat.forget doing sth.I ll never forget seeing my daughter dance in public for the first time.forget about sb. sth.Let s forget about our differences.break downThe car broke down halfway to the camp.had betterhad better not do sth.I d better get ready for it f

16、irst.Youd better not wake him up. He is too tired. Hadnt we better not invite him.first of all創 作人：歷恰面日 期：2020 年 1 月 1 日at firstfill withHe filled the bucket with water.keepkeep sb. / sth. + adj Keep the water pure. keep sb. /sth. + VingYou shouldn t keep the water running. keep sb. /sth. + VedKeep

17、your eyes closed.on saleThe new model is not on sale in the shop. for saleHe has put his house up for sale.feedfeed sb. with/on sth.She was feeding the baby with porridge. feed sth. to sb.We feed meat to our dog.模擬試題創 作人：歷恰面日 期：2020 年 1 月 1 日單項選擇1. You will be lateyou don t leave immediately.A. unle

18、ssB. untilC. ifD. or2. you keep ice-cream in a fridge, it melts.A. UnlessB. UntilC. IfD. Or3. If youa fish out of water, it.A. will take/will dieB. take/diesC.will take/diesD. took/dead4. If youyour timetable every night, youwhich books to take.A. will check/will knowB. check/knowC. will check/knowD

19、.check/willknow5. Youtoothache if youyour teeth regularly.A. will have/cleanB. will have/do not cleanC. have/will cleanD. will have/will not clean6. Ithe police and complain about that noise unless itsoon.A. shall telephone/stopsB. shall telephone/does not stopC. telephone/will stopD. telephone/will

20、 not stop7. If youthe tickets with you, weto enter the cinema.A. do not take/will not allowB. take/will not allowC. do not take/will not be allowedD. take/will not be allowed8. If the fishfrom the bird s mouth, the bird will swallow it.創 作人：歷恰面日 期：2020 年 1 月 1 日A. won t removeB. won t be removedC. doesn t removeD. isn t removed9. If the rain doesn t stop, you can enjoyhere for another day.A. stayB.