三大从句之一：典型例句突破状语从句
前言：学习状语从句的几个关键点 1）引导状语从句的连词及意思 2）状语从句与主句的时态照应 提高学生掌握：----
3）有关状语从句的重点句型。4）状语从句的省略 一．各种状语从句的典型例句
1．条件状语从句：引导条件状语从句的词（组）主要有if, unless, so (as) long as, 注意：条件从句中的if 不能用whether替换。
提高掌握：on condition that, so (as) far as, if only ( = if )。
1）Let's go out for a walk unless you are too tired.( ) 即：If you are too tired,we’ll not go out for a walk.
2）You may borrow my book as long as you keep it clean.( ) 提高掌握：
3）I can tell you the truth on condition that you promise to keep a secret.( -) 4）Supposing it rains, shall we continue the sports meeting?( )
5）You will be successful in the interview once you have confidence.( )
2.时间状语从句：表示时间的状语从句可由when, as, while, whenever, after, before, till (until), since, once, as soon as
提高学生掌握：(或the moment ), by the time, every time等引导。
1）When she came in, I stopped eating. (当---的时候，表示“瞬时动词”) 2）While my wife was reading the newspaper, I was watching TV. (当---的时候，was reading是延续性的动词，was reading和was watching同时发生)
3）I like playing football while you like playing basketball.（然而，表示“对比”） 4）As we was going out, it began to snow.（as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间）
5）We always sing as we walk.（as表示“一边……一边”）
6）Einstein almost knocked me down before he saw me.(“在---之前”或“----才”)
7）After you think it over, please let me know what you decide. （在---之后） 8）I didn't go to bed until（till）my father came back.(“直到----才”，主句中的动词为非延续性动词)
9）I worked until he came back. (“直到----才”，主句中的动词为延续性动词) 10) Where have you been since I last saw you? (自从---)
11)As soon as I reach Canada, I will ring you up. (一----就---)
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提高学生掌握：
12) Each time he came to Harbin, he would call on me.( “每当---的时候”或“每次”，复习each time, every time和whenever)
13) I will go there immediately,I have finished my breakfast. (一----就---，另外有 instantly)
14)The moment I heard the news, I hastened to the spot. (一----就---，另外有the instant, the minute，ect.)
15) By the time you came back, I had finished this book.(“到---时为止”，从句是一般过去时，主句是过去完成时。)
提高学生掌握：
．有关时间状语从句的重点句型
1）It will be four days before they come back. (It will be--- before---过很久才----) 2）It won’t be four days before they come back.( It won’t be---before---不久就---) 2）It was not until the meeting was over that he began to teach me English.(“ It was not until---that----” not until的强调句型)
3) It is/has been five months since our boss was in Beijing.我们老板离开北京有五个月了。(“It is/has been---since” 自从---以来多长时间)
4) Hardly had I sat down when he stepped in.我刚坐下，他就进来了。（“hardly/scarcely----when---”/同“no sooner ---than” 注意时态的应用。）
3．原因状语从句；原因状语从句是表示原因或理由的，引导这类从句的最常用的连词是because, since, as , now that（既然）等，for 表示因果关系时（它引导的不是从句）为并列连词，语气不如because强。
1)The sweater shrank because it was washed badly. (强调“直接原因”) 2)Since [As] we’ve no money, we can’t buy it. （由于）
3) Since you are free today, you had better help me with my mathematics. （“既然”强调双方共知的原因,
4）He could not have seen me, for I was not there.( for引导的原因状语从句并不说明主句行为发生的直接原因， 只提供一些辅助性的补充说明， for引导的原因状语从句只能放于主句之后并且必须用逗号将其与主句隔开。)
4结果状语从句 由so that （从句谓语一般没有情态动词），so … that, such … that等引导
She was ill, so that she didn’t attend the meeting. He was so excited that he could not say a word. She is such a good teacher that everyone admires her.
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5．目的状语从句引导目的状语从句最常用的词（组）是so, so that（从句谓语常有情态动词）= in order that, in case（以防，以免）等。
1）You must speak louder so that /in order that you can be heard by all.( 为了；以便)
2.Speak clearly, so that they can understand you.
3）Better take more clothes in case (以免)the weather is cold.
6．让步状语从句让步状语从句可由although, though, as, even if (though), 提高掌握：however, whatever, 注意：as引导的让步状语从句一般是倒装的。
1）Although/Though he was worn out, (still) he kept on working.( 虽然，纵然,尽管)
2) We’ll make a trip even if/though the weather is bad. (“即使……”) 提高掌握
3)Hard as/ though he works, he makes little progress. ( 虽然，纵然，尽管) 4)Child as/though he was, he knew what was the right thing to do. ( 虽然，纵然，尽管)
5) No matter who you are, you must keep the law.(=Whoever you are, you must keep the law.（无论谁，复习no matter +疑问词引导的状语从句。） 6）While I like the colour, I don't like the shape.（尽管） 7．方式状语从句
You must do the exercise as I show you.
二．状语从句的省略：
状语从句的省略原则主要是：如果从句中的主语和主句中的主语一致，就可以经过一定的变动把状语从句中的主语和谓语的一部分或全部省略，或从句中是it is ,可以把it is省略，从而使语言更加简洁、明了。现就把各种状语从句的省略现象列举如下： 1.While(I was) at college, I began to know him, a strange but able student. 2．Don’t come in until (you are) asked to.
3．Whenever (it is )possible, you should come and help.
4．Put in articles wherever(it is) necessary in the following passages. 5. He will come if (he is) asked.
6. Even if (I am ) invited to, I won’t go to such a bad lecture. 7. She has finished the work earlier than (it has been ) expected.
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状语从句巩固练习题：
一：基础巩固对比练习题 第一组：
( ) 1 The meeting didn't start___ everyone was there. A. because B. until C. why D. if
( ) 2 The boy ___ to bed ___ his mother came in.
A. went not; until B. didn't go; after C. went; until D. didn't go; until ( ) 3 I won't believe you___ I have seen it with my own eyes. A. before B. until C. after D. when
( ) 4 Tom will call me as soon as he ___ Shanghai. A. arrives B. will reach C. arrives in D. get to
( ) 5 I'm sure he'll come to see me before he ___ Beijing. A. will leave B. is leaving C. leave D. leaves
( ) 6 I will tell him the news as soon as he___ back. A. come B. comes C. will come D. came 第二组：
( )7 Tom has got a watch. He ___ it for two years. It _______ by his father. A. has bought; was bought B. has got; is bought ,
C. was bought; has bought . D. has had; was bought \8 We ___ TV when the telephone ____.
A. watched; was ringing B. were watching; rang C. watch; rings D. are watching; rang 第三组：
( ) 9 I ___ you for a long time. Where ___ you ___? A. didn't see; did; go B. didn't see; have; gone
C. haven't seen; have; been D. haven't seen; have; gone ( ) 10 Tom___ China for 3 years.
A. has been B. has been in C. has been to D. has been at
( ) 11 I won't go to see the film tonight, because I ___ my ticket. A. lost B. have lost C. will lose D. didn't lose ( ) 12 -Hello! May I speak to Bob? -Sorry, but he ___ for a month.
A. had been away B. was left C. left D. has been away ( ) 13 I ___ him since I began to live in the city. A. know B. have known C. knew D. will know 第四组：
( ) 14 Betty didn't go to see the film yesterday ___ she was ill. A. because B. but C. until D. if
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