考点35 条件状语从句备战中考英语考点一遍过.docx

1、考点35 条件状语从句备战中考英语考点一遍过考点35 条件状语从句条件状语从句，即在某种条件下，一件事情可能发生。在英语中由连接词if或unless等引导的状语从句叫作条件状语从句。条件是指某一件事情实现之后（状语从句中），一件事情（主句）才能发生，通常译作假如，只要，如果等意思。条件状语从句中，主从句的时态要遵循主将从现的原则。即，主句是将来时态时，从句用一般现在时代替将来时态。引导条件状语从句的连词或词组有：if(如果)，unless(除非)，as long as(只要)等。如果主句是将来时，条件状语从句也用一般现在时来表示。如：I will stay at home if it rain

2、s tomorrow. 如果明天下雨，我就待在家。You cant learn English well unless you work hard.除非你努力学习，否则是学不好英语的。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, well 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？If you ask him, he will help you. 如果

3、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。 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。 You will f

4、ail to arrive there in time unless you start earlier. 如果你不早点动身，你就不能及时赶到那儿。 Unless it rains, the game will be played. 除非下雨，比赛将照常进行。 3. as /so long as引导的条件状语从句 as /so long as的意思是只要 So long as youre happy, I will be happy. 只要你高兴，我就高兴。You may borrow my book as long as you keep it clean. 只要你保持书的清洁，你就可以把我

5、的书借去。 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。 提示：在条件状语从句中，用一般现在时代替一般将来时，用一般过去时代替过去将来时。 If the weather is bad next week, well put off the climbing. 如果下周天气不好，我们将推迟爬山。 Father told m

6、e if I worked hard he would buy me a gift. 爸爸告诉我，如果我努力学习，他会给我买一份礼物。5. 引导条件状语从句最常用的连词是if，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。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。 If you have finished the homework, you c

7、an 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。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。 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。 6. 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。

8、If he runs hell get there in time. 如果他用跑的，他就会及时赶到那儿。 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/can。 If the fog gets thicker the plane may/might be diverted. 如果雾再大一些，飞机可能就会改在别的机场降落。 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

9、/should。 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。 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。 If you are looking for Peter youll 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。 If you h

10、ave finished dinner Ill ask the waiter for the bill. 如果你吃完了，我就叫服务生来算账。【知识拓展】 1. 在以when，before，as soon as等引导的时间状语从句，也适用主将从现原则，即如果主句是一般将来时，从句则用一般现在时。 Ill tell her the good news when she comes back. 当她回来的时候，我将把这个好消息告诉她。 she will give you a call as soon as she returns.她一回来就会给你电话。 2.If条件句的同义句：祈使句，and /or

11、+将来时态的陈述句。 Work hard, and you will make great progress.= If you work hard, you will make great progress. 如果你努力学习，你就会取得大的进步。 Hurry up, or you will be late.=If you dont hurry up, you will be late. 如果你不快点，你就要迟到了。【巧学妙记】 if 引导的条件状语从句的记忆口诀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。一、用

12、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 dog. 6. Lana _(buy)

13、 a new dress if the old one _(be) out of style. 7. The twins _(fight) if they _(argue). 8. I _(sell) my paintings 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 bea

14、ch 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 Un

15、iversity.二、完成句子 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。 If you _ _, you _ _ _ _. 3. 他如果看电视太久了，他的父母会不高兴。 If he _ TV too much, his parents _ _ unhappy. 4. 如果我们为他组织生日聚会，大家都会来的。 Everyone _come if we _a birthday party _him. 5. 如果明天不下雨，我会和你一起去公园的。 If it _ _tomorrow, I _go to the park _

16、you. 6. 如果她起晚了，就会旅游迟到。 She _ _ _ _ the trip if she _ _ late 7. 如果他有空，他会帮助你的。 If he _ _, he _ _you. 8. 如果Tom成为足球运动员，他就不会上大学了。 Tom _ _go to the college if he _a soccer player. 9. 你如果不完成作业就不能学好各门功课。 You _ _good at all the subjects if you _finish the homework.10. 如果你上课睡觉，老师会生气。 If you _in class, your te

17、acher _ _ _.1. （2019 黑龙江省齐齐哈尔市）The students of Grade 9 have to take part in the P.E. test.Yes, _you want to pass it and be stronger, practice more.A. unless B. until C. if2. （2019 贵州省贵阳市）Our eyesight will become poorer and poorer we keep playing with phones.A. though B. unless C. if3. （2019 青海省中考）Th

18、e environment will be much worse _ everyone has a sense of protecting it. A. unless B. if C. so that4. （2019 安徽省）Our business wont improve _ we offer better service to our customers.A. because B. unless C. after D. since5. （2018 菏泽中考）I really want to pass the exam for further study.Believe in yourse

19、lf, dear! Your dream will came true _ you put your heart into it.A. even if B. as long as C. as soon as6. （2018 安顺中考）The weather report says that it _ tomorrow in most parts of Anshun city.If it _, the school sports meet will be canceledA. will rain; will rain B. will rain; rainsC. rains; will rain

20、D. rains; rains7. （2018 恩施中考）If you are caught smoking in the kitchen, you _ by your boss.A. will fire B. are fired C. will be fired8. （2018 江西中考）Can students go online during lessons?They can _ it is for that lesson.A. if B. or C. so D. but9. （2018 四川乐山中考）Thank you for telling me so much knowledge

21、about nature.Dont mention it. _ you have more questions, come to me any time.A. If B. Because C. Though10. （2018 菏泽中考）I really want to pass the exam for further study.Believe in yourself, dear! Your dream will came true you put your heart into it.A. even if B. as long as C. as soon as1. （安徽省亳州市利辛县20

22、18届九年级10月月考）You wont get to the subway station before 9 :00 am _ you leave earlier. A. unless B. until C. because D. when2. （黑龙江杜尔伯特县蒙古族中学2018届九年级（五四学制）上学期期中）If New Mart _ 24 hours a day during the winter holiday, I will feel _. A. is open；excited B. is open；exciting C. will open；excited D. will ope

23、n；exciting3. （云南省马龙县通泉镇中学2017届九年级下学期第一次模拟）I wont be able to understand what you say, you speak too quickly. A. if B. though C. because D. but4. Lucy and I have been friends for years. _ my memory is correct, we first met in a meeting. A. If B. Because C. Though D. When5. （广东省东莞市2017届中考冲刺考前押题）I think

24、 you should complain _ you are happy with the situation. A. unless B. however C. after D. though6. （江苏省扬州市江都区2017届中考第二次模拟）I will have to close my clothes shop _ my business improves. A. if B. unless C. after D. when7. Chuck will go swimming with us tomorrow afternoon _ he can finish his homework by

25、then. A. so B. but C. if D. or8. _ you have a picnic this weekend, remember to call me. A. As B. For C. If D. Because9. （江苏省盐城市毓龙路实验学校2017届九年级中考第一次模拟）I usually sleep with the window open _ its very cold. A. until B. as C. if D. unless10. （江苏省徐州市部分学校2017届九年级二模联考）Could you give me some advice on trave

26、lling? Take a map with you _ you have a guide or you know the city well. A. if B. unless C. although D. because11. （上海市华东师范大学第二附属中学2017届九年级下学期周测）It is seven oclock. You will be late for school _ you get up right now. A. unless B. until C. when D. though12. Excuse me, could you please tell me if the meeting _ on time? If it _ tomorrow, well have to put it off. A. will hold；snows B. will be held；snows C. will be held；snow D. holds；will snow跟踪训练一、用所给词的适当形式填空 1. feel；will have 2. will；see；has 3. are；will be 4. will dress；doesnt work5. lives；will keep 6. will buy；is 7. will fight；argue