1、 1 条件句 【 条件句 】 （一） 真实 条件句 连接词 条件从句 结果从句 If If + 主语 + 一般现在时 一般 将来时 -表可能 ： If he runs, hell get there on time. may/ might/ can-允许 /能力 ： If it stops snowing, we can go out. must/ should-命令，请求，劝告 ： If you want to lose weight, you must/ should eat less bread. 一般现在时 -客观事实 ： If you heat ice, it turns to wa
2、ter. （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 连接词 条件从句 结果从句 If If + 主语 + 一般 过去时（ be动词一般用 were） 主语 + should/would/ could/ might +动词原形 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 immedia
3、tely(立即、立刻 ). If I didnt 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 do? If I were to see her tomorrow, I would tell her the truth. 三、与过去事实相反 连接词 条件从句 结果从句 If If +主语 +过去完成时（ had+过去分词 ） 主语 +should/would/could/might+ have+过去分词 如： If Id known that it
4、 was going to rain, I would never have gone for a walk in the country. If I hadnt had a cold last week, I wouldnt have missed your birthday party. 连接词 条件从句 结果从句 If If + 主语 + should/would/were to+动词原形 主语 + should/would/ could/ might +动词原形 2 例题 ( )1. I dont know if it _tomorrow. If it _,we wont go on
5、a picnic. A. rains;rains B. will rain;rains C. will rain;will rain ( )2. In summer , food goes bad easily _ it is put in the refrigerator. A. until B. if C. unless ( )3. -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
6、 Before ( )4. Could we play football in your playground, Sir ? -No,_ you have the principals note. A.if B.unless C.because D.since ( )5. Many children like fried chicken _it is unhealthy food. A.if B.because C.although ( )6. All the students in Class 5 will climb the mountain if it _ rain tomorrow.
7、A. wont B. dont C. didnt D. doesnt ( )7 -Would you like to go bike riding with us tomorrow? -Sure, _ I am busy. A. since B. unless C. when D. until ( )8. I dont like bread. I wont eat it _ I am very hungry. A. when B. unless C. if ( )9. Youd better look up the new word in a dictionary _ you dont kno
8、w it. A. if B. that C. though D. whether ( )10. After the meeting, we will have a party. If you _ free, come and join us. A. are B. will be C. were 练习 ( )1. Ill go for a walk with you if it _ tomorrow. A. wont rain B. doesnt rain C. will rain D. not rains ( )2. Im waiting for my Mum. _, Ill go shopp
9、ing with her. A. If she doesnt come B. If she comes C. If she will come D. If she wont come ( )3. -Tommy, do you know if Frank _ to the zoo this Sunday if it _? -Sorry, I have no idea. A. will go; is fine B. goes; is fine C. will go; is going to be fine D. goes; will be fine ( )4. If I _ you, I woul
10、d wear the shirt and the tie. A. am B. was C. were D. will be ( )5. What would you do if you _ a lot of money? A. had B. have had C. will have D. have ( )6. In Britain, you must be 18 _ you want to drive a car. 3 A. why B. because C. so D. if ( )7. If I _ you, Id take the small apple. A. am B. were
11、C. was ( )8. Susan will not arrive at the airport on time _ she hurries up. A. once B. if C. when D. unless ( )9. If my father _ back, please let me know. A. comes B. will come C. come ( )10. Lets see _we can find some information about the city. A. that B. if C. what D. which ( )11.If I you, I a bi
12、g house. A. was, would buy B. were, would like to buy C. were, would buy D. was, bough ( )12.If he tomorrow, please tell me. A. come B. comes C. will come D. came ( )13.What would you do if you the lottery( 彩票 )? A. win B. won C. are going to win D. have won 4 典型例题 1B 2C3A4B5C6D 7B。考查 unless 引导的条件状语
13、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。 8B 9A。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。 2B 3A。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。 4C 5A。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。 6D 7B。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 5
