Chapter 6 Memory知识总结与归纳：“if”与“unless”引导的条件状语从句条件句，放在前，逗号要放句中间。条件句表可能，主句多用将来时；条件句表事实，主句常用现在时。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 cant 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.要点：表示状语从句由连词if，unless（if not） 引导。1. If it doesnt rain tomorrow, we will go hiking.如果明天不下雨，我们就去远足。2. You will get good grades if you study hard.如果你努力学习，就会取得好成绩。3. I will go to the party unless he goes there too.我不会去参加聚会的，除非他也去。（如果他不去，我也不去。）4. You will be late unless you leave immediately.如果你不马上走，你将会迟到的。（If you dont leave immediately, you will be late.）难点提示：用条件状语从句时要注意时态的正确使用，当主句是将来时的时候，从句要用一般现在时。1. He will not leave if it isnt fine tomorrow.（一般将来时，一般现在时）2. They are going to have a picnic if it doesnt rain next week.（一般将来时，一般现在时）状语从句知识归纳状语从句（Adverbial Clause）状语从句指句子用作状语时，起副词作用的句子。它可以修饰谓语、非谓语动词、定语、状语或整个句子。根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。状语从句一般由连词（从属连词）引导，也可以由词组引起。从句位于句首或句中时通常用逗号与主句隔开，位于句尾时可以不用逗号隔开。状语从句的种类用来修饰谓语动词、其它动词、定语、状语或整个句子的从句叫做状语从句。状语从句可分为：1. 时间状语从句；（adverbial clause of time） 2. 地点状语从句；（adverbial clause of place） 3. 原因状语从句；（adverbial clause of cause） 4. 条件状语从句；（adverbial clause of condition） 5. 目的状语从句；（adverbial clause of purpose） 6. 让步状语从句；（adverbial clause of concession） 7. 比较状语从句；（adverbial clause of comparison） 8. 方式状语从句；（adverbial clause of manner） 1. 时间状语从句（adverbial clause of time）由when，while，as引导的时间状语从句。例如：When you think you know nothing, then you begin to know something.Strike while the iron is hot.Will you watch my clothes while I have a swim?You can feel the air moving as your hand pushes through it.Our headmaster laughed as she spoke.It will be four days before they come back. Einstein almost knocked me down before he saw me.My father had left for Canada just before the letter arrived.They had not been married four months before they were divorced. After you think it over, please let me know what you decide.After we had finished the work, we went home. I didnt go to bed until（till）my father came back.It was not until the meeting was over that he began to teach me English.I worked until he came back.I didnt work until he came back.Please wait until I arrived. I have been in Beijing since you left.As soon as I reach Canada, I will ring you up.2. 地点状语从句；（adverbial clause of place） Where there is no rain, farming is difficult or impossible.They were good persons. Where they went, there they were warmly welcomed. You should have put the book where you found it. Where there is a will, there is a way.It will be mixed school where not all the children are disabled.Wherever you go, I go too.Wherever there is smoke, there is fire.While she was wondering where to go, she met a policeman.3. 原因状语从句；（adverbial clause of cause） I didnt go to school yesterday because I was ill.Since everybody is here, lets begin our meeting.As you are in poor health, you should not stay up late.I asked her to stay to tea, for I had something to tell her.4. 目的状语从句；（adverbial clause of purpose） The scientists report was so instructive that we were all very excited.He always studied so hard that he made great progress. I opened the window so that fresh air might come in.Its such nice weather that all of us want to go to the park.We shall let you know the details soon in order that you can/may make your arrangements.5. 让步状语从句；（adverbial clause of concession） Although he is rich, yet he is not happy.Although we have grown up, our parents treat us as children.Even though I didnt under a word, I kept smiling.He is quite experienced, he is young, though.6. 比较状语从句；（adverbial clause of comparison） Jack is as tall as Bob.She is not so（as）outgoing as her sister.This book is more instructive than that one.This book is the most interesting of the three.This road is the busiest street in our city.7. 方式状语从句；（adverbial clause of manner） Always do to the others as you would be done by.Just as we sweep our rooms, so we should sweep backward ideas from our minds.They completely ignore these facts as if（as though） they never existed.练习1. _youve tried it, you cant imagine how pleasant it is.A. Unless B. Because C. Although D. When 2. We wont keep winning games _ we keep playing well.A. because B. unless C. when D. while 3. _you call me to say youre not coming, Ill see you at the theatre.A. Though B. Whether C. Until D. Unless 4. Start out right away, _youll miss the first train.A. and B. but C. or D. while 5. Stand over there _youll be able to see it bette