中考初中英语条件状语从句分析（全，含练习及答案）本节课我们学习其中的条件状语从句。
目录：一、概念；二、时态；三、条件状语从句的引导词；（一）if 引导的条件状语从句；（二）unless引导的条件状语从句；（三）as /so long as引导的条件状语从句；（四）once引导的条件状语从句；四、条件状语在句中的位置；五、转换；六、拓展；七、综合练习；一、概念在某种条件下，可能发生某事。
由if/unless等引导的表示条件的句子，就叫条件状语从句。
e.g:If you put wood into water, it floats.如果你把木头放到水里，它就会浮起来。
Unless you keep ice cream in a fridge, it melts.除非你把冰淇淋放进冰箱，不然它就会融化。
二、时态1．当主句和从句所表示的是原理、客观真理、规则时，主句是一般现在时（包括祈使句和含有情态动词can/may/must等），从句也要用一般现在时。
例如：1) If you put a piece of paper into water, it gets wet．如果你把一张纸放进水中，它会变湿。
(原理)2)Be careful if you cross the road.(祈使句)3) You must see the doctor if you are ill.( 含有情态动词）2. 在if条件状语从句中，如果从句谈论的是一个可能发生的事实及其产生的相关结果，主句用一般将来时，从句用一般现在时。
e.g:1) If it rains tomorrow, we will not go to the zoo.2) If you go to bed earlier, you won't feel tired in the morning.3. 如果从句用现在进行时或现在完成时，主句需用一般将来时。
1）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。
2）If you have 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。
三、条件状语从句的引导词（一）if 引导的条件状语从句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 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。
另外还要注意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If he runs, he’ll 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/canIf the fog gets thicker, the plane may/might be diverted. 如果雾在大一些，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/shouldIf 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 have 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注意：学习了" if " 引导的条件状语从句的用法，现在进行总结一下:在 if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。
如：We can walk there if we can't find a bus.If it rains tomorrow, we will not go to the zoo.What will you do if you find a panda in danger?如果 if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从句大多用一般现在时态。
如：If bears are in danger, they attack people.（二）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。
同义句转换：Work hard, or you will fail in English.→ You will fail in English ________ _________ ________ work hard.[答案] if you don’t（三）as /so long as引导的条件状语从句as /so long as意思是“只要”So long as you're happy, I will be happy. 只要你高兴，我就高兴。
（四）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。
Father 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。
四、条件状语在句中的位置大多数情况下，if/unless从句既可以放在主句之前也可以放在主句之后。
当从句置于主句之前时，常用逗号与主句隔开。
It floats if you put wood into water. = If you put wood into water, it floats.五、转换1、当主语是you时,if引导的条件状语从句可与“祈使句+ and／or+简单句”进行句型转换。
and表示句意顺承；or表示转折，意为“否则”。
例如：Take care, or you'll fall off the tree. 小心，否则你会从树上掉下来。
=If you don't take care, you'll fall off the tree.2. unless也可引导条件状语从句，相当于if...not，意思是“如果不、除非”。
例如：You will fail in Math unless you work harder.= You will fail in Math if you don't work harder.你要是不再加把劲儿，数学考试就不及格了。
六、拓展1. if从句还可以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，主句则用虚拟语气。
1) If I were you, I would invite him to the party.2) I would have arrived much earlier if I had not been caught in the traffic.2. if表示“是否”时引导宾语从句，意思同whether.I don’t know if he can come.If he comes, I' ll tell you at once.以下请同学们来做一些练习吧！答案：1. feel; have2. will; he; has3. are; will be4. will dress; doesn’t work5. lives; will keep6. will buy; is7. will fight; argue8. will have; need9. will send; tours 10. says; will feel答案：1. C2. D3. B4. A5.B6. D7. won’t; u nless8. will; unless一、英语阅读理解专项练习试卷1．阅读理解Maybe we three were the most unlucky graduates in our school history. I'll never forget the day when we had our graduation ceremony(毕业典礼).I was known for being careless. I often fell down for no reason. Since I fell off the stage(舞台)during my Primary Graduation Ceremony, my family bet(打赌)that I would fall down again during my next graduation ceremony. The day came so quickly. This time, I proudly made it through the whole ceremony without falling. but I knocked over the whole backdrop (背景板)used to take pictures for graduates! I felt so embarrassed (尴尬的)the whole morning.My friend Julia was even more embarrassed. When she together with all the graduates was sitting quietly in the hall at eight in the morning, she didn't expect her father to come to attend her ceremony because he was really busy then. The hall was very quiet and you could even hear a pin(针)drop on the ground. When all of a sudden, out of the silence, she heard "Hey,Julia!" Everyone in the hall looked behind and found Julia's father, with a camera in his hand, smiling at her!Tiffany was the most beautiful girl of us three. She loved all kinds of dresses. On that day, she dressed herself beautifully and wanted to have some beautiful photos. Unluckily, it was one of the windiest days of our life. The wind blew her beautiful dress up in front of the whole graduate class! She didn't know whether to cry or laugh.Lucky? Unlucky? So lucky! All of these became the unforgettable part of our life!（1）The writer was very in her daily life.A.carelessB.carefulC.friendlyzy（2）Julia's father at the graduation ceremony.A.sat quietly in his seatB.was busy with his workC.took pictures for herD.dropped a pin on the ground（3）This story happened on a morning.A.cloudyB.windyC.sunnyD.rainy（4）Tiffany was embarrassed because that day.A.she fell off the stageB.she didn't have beautiful dressesC.her dress was blown upD.her photos weren't unforgettable（5）Which of the following is TRUE according to the passage?A.The girls weren't in the same school.B.The writer knocked over the backdrop.C.Julia knew that her father would come.D.Tiffany loved all kinds of shoes.【答案】（1）A（2）C（3）B（4）C（5）B【解析】【分析】文章大意：文章讲述了在毕业典礼上，三个孩子身上所发生的的尴尬的事。