中考英语复习考点《条件状语从句》

1、中考英语复习考点条件状语从句一、考点详解：定义：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 i

2、t rains tomorrow. 如果明天下雨，我就待在家。You can't 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, 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？If you ask him, he will

3、 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。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

4、 will fail 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 you re 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

5、可以把我的书借去。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, we ll put off the climbing.如果下周天气不好，我们将推迟爬山。Fath

6、er told me 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

7、, 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。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

8、时。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 mus

9、t/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 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。If you h

10、ave 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。【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 般将来时，从句则用一般现在时。I ll 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.第 3 页 共 11 页她一回来就会给你电话。2.1 f条

11、件句的同义句：祈使句，and/or+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 don't 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

12、，主将从现要遵从；条件句非真实，虚拟语气用到位。二、跟踪训练：(一)、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 dog.6. La

13、na(buy) 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 beach if it (not ra

14、in) 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.( 二 )、完成句子1. 如果他到的晚了会

15、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 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

16、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 teacher .三、真题再现：1. （2019 ?黑龙江省齐齐哈尔市 ）一The students of Grade 9 have to take part in the P.E. test. Ye

17、s,you want to pass it and be stronger, practice more.A. unlessB.untilC.if2. （2019 ?贵州省贵阳市 ）Our eyesight will become poorer and poorer we keep playing with phones.A. thoughB.unlessC.if3. （2019 ?青海省中考）The environment will be much worse everyonehas a sense of protecting it.A. unlessB. ifC. so that4. （2

18、019 ?安徽省）Our business won ' t improve we offer better service to our customers.A. becauseB. unlessC. afterD. since5. （2018 ?荷泽中考）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 ifB. as long asC. as soon as6

19、. （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 canceled .A. will rain; will rainB. will rain; rainsC. rains; will rainD. rains; rains7. （2018 ?恩施中考 ）If you are caught smoking in the kitchen, you by your boss.A. will fireB. ar

20、e firedC. will be fired8. （2018 ?江西中考）Can students go online during lessons? They can it is for that lesson.A. ifB. orC. soD. but9. （2018 ?四川乐山中考）Thank you for telling me so much knowledge about nature.-Don' t mention it.you have more questions, come to me any time.A. IfB. BecauseC. Though10. （2

21、018 ?荷泽中考）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 ifB. as long asC. as soon as第 5 页 共 11 页四、模拟检测：1.（安徽省亳州市禾辛县2018 届九年级 10 月月考）You won ' t get to the subway station before 9 :00 amyou leave earlier.A

22、. unlessB. untilC. becauseD. 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）IfNew Mart 24hours a day during the winter holiday, I will feel.A. is open ; excitedB. is open ; excitingC. will open ; excitedD. will open ; 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 won ' t be able to understand what you say

23、,you speak too quickly.A. ifB. thoughC. becauseD. but4 . Lucy and I have been friends for years.my memory is correct, we first met in a meeting.A. IfB. BecauseC. ThoughD. When5 .（广东省东莞市 2017 届中考冲刺考前押题 ）I think you should complain you are happy withthe situation.A. unlessB. howeverC. afterD. though6

24、.（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 mybusiness improves.A. ifB. unlessC. afterD. when7 . Chuck will go swimming with us tomorrow afternoon he can finish his homework by then.A. soB. butC. ifD. or8 .you have a picnic this weekend, rememberto call me.A. AsB. ForC. IfD. Because

25、9 .（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 openit's very cold.A. untilB. asC. ifD. unless10 .（江苏省徐州市部分学校2017届九年级二模联考）一Could you give me some advice on travelling? Take a map with you you have a guide or you know the city well.第7页共11页A. ifB. unlessC. althoughD. because11.（上海

26、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 o'clock. You will be late forschoolyou get up right now.A. unlessB. untilC. whenD. though12. Excuse me, could you please tell me if the meetingon time?一 If ittomorrow, we'll have to put it off.A. will hold ; snowsB. will be held ; snowsC. will be held ;

27、 snowD. holds ; will snow五、参考答案：跟踪训练一、用所给词的适当形式填空1. feel; will have5. lives ; will keep9. will send ; tours13. will write ; gets二、完成句子1. will happen ； is4. will ; organize; for7. is free; will help10. sleep; will be angry1. C【解析】句意：一2. will ； see; has6. will buy ; is10. says; will feel14. gets; won&

28、#39; t catch2. study hard;3. are; will be7. will fight ; argue11. will go ; doesn ' t rain15. will major ; passeswill get good grades5. doesn't rain ; will ; with8. will never ; becomes4. will dress ; doesn t work8. will sell ; need12. Will ; have; is3. watches; will be6. will be late for ；

29、gets up9. won't be; don't真题再现九年级的学生们必须参加体育考试。一一是的，如果你想通过它更强壮，更多的练习吧。A. unless如果；B. until直到；C. if如果。根据practice more.可知，这里是if引导的条件状语从句，遵循主句是祈使句，从句用一般现在时态。根据题意，故选 Co2. C【解析】句意：如果我们继续玩手机，我们的视力会越来越差。A. though尽管，虽然；B. unless除非;C. if如果。这里是if引导的条件状语从句，遵循主句用一般将来时，从句用一般现在时态，根据题第 11 页 共 11 页意，故选C。3. A

30、【解析】句意：除非每个人有保护环境的意识，否则环境将会更糟糕。 A 表示除非， B 表示如果， C 表示为了。根据题干可知除非每个人有保护环境的意识，否则环境将会更糟糕，本句是unless 引导的条件状语从句。故选 A 。4. B 【解析】句意：除非我们为顾客提供更好的服务，否则我们的生意就不会好转。 because 因为，引导原因状语从句；unless除非，引导条件状语从句；after在之后，引导时间状语从句；since自从，引导时间状语从句。根据主句 Our business won ' t improv蚁及从句中offer better service可知，从句中也应表示否定的意

31、思，unless相当于if not "如果不"，符合句意，故选 B。5. B 【解析】句意： 我真的想通过考试，继续深造。 相信你自己，亲爱的！只要你用心去做，你的梦想就会成真。考查连词辨析题。A. even if即使，表让步；B. as long as只要，表条件；C. as soon as一就。本句是条件状语从句，需用 as long as连接。根据句意语境，可知选 B。6. B 【解析】句意： 天气预报说明天安顺大部分地区会下雨。 如果下雨，学校体育运动将会取消。第一个句子为宾语从句，根据tomorrow 判断，从句的时态为一般将来时，首先排除C,D ；第二个句子中，

32、 if 引导的是条件状语从句，遵循 “主将从现” 的原则，因为主句是一般将来时，因此if 引导的从句用一般现在时，故答案为 B 。7. C 【解析】句意：如果你在厨房里被抓到吸烟，你就会被老板开除。你只能“被开除” ，所以需要使用被动语态be done,如果主句是将来时，那么 if引导的条件状语从句用一般现在时表将来，这是主将从现的用法，本题中从句是说如果被抓到抽烟的话，用了一般现在时，那么主句用一般将来时，表示 “你将会被开除” ，所以用一把将来时的被动语态， will be done ，故选 C，8. A 【解析】句意： 学生可以在课上上网吗？ 如果是为了上课，他们可以上网。考查连词辨析题

33、。if 如果，表条件； or 或者，表选择； so 所以，表结果； but 但是，表转折。答句是条件状语从句，需用 if 连接。根据句意结构，可知选 A 。9. A 【解析】句意： 谢谢你告诉我这么多关于自然的知识。 别提了。如果你有更多的问题，随时找我。考查连词辨析题。本句是条件状语从句，需用 if连接，而because表原因，though表让步，都可排除。根据句意结构和语境，可知选 A 。10. B 【解析】句意： 我真的想通过考试，继续深造。 相信你自己，亲爱的！只要你用心去做，你的梦想就会成真。考查连词辨析题。A. even if即使，表让步；B. as long as只要，表条件；C. as soonas一就。本句是条件状语从句，需用 as long as连接。根据句意语境，可知选 B。模拟检测1. A 【解析】句意：除非你早点离开，否则你在九点之前不会到达地铁站。A. unless除非；B. until直到；C. because因为；D. when什么时间。根据题意，除非你早点离开，所以连接词用unless。故正确答案为Ao2. A 【解析】句意：如果新玛特在寒假期间一天24小时营业，我将会感到很激动。i