初中英语状语从句
初中英语状语从句课件(共68张ppt)
After you think it over, please let me know what you decide.你仔细考虑过以后，告诉我你是 怎样决定的。
外星人买纪念品时，那女孩给警察打了电话。(表示主句，从句
的动作同时发生，while后引导的状语从句的动词必须是延续动词不能
是点动词，因为它表示较长时间)
mother was worried because little alice was ill, especially as (when/ while) father was away.
我到那里时，正在下大雨。 ( 动作同时发生，when
可换为as, 但不能换为while，因为get是点动词.)
When I had read the article, he called me.
我看完这篇文章之后，她给我打了电话。( 从句动作
发生在主句之前，注意时态表达，只能用when )
When I got to the cinema, the film had begun.
when
1、还可以表示从句动词的动作在主几句动词的动作"
之前 "或"之后"发生。
2、when=and then; at that moment (正在那个时候)
while 1、用于时间较长时
2、 强调两个动作同时进行，并表示对比时
有时这三个连词可以互换，有时不可以。
It was raining hard when (as) I got there.
状语从句(43张PPT)初中英语专项复习课件
知识点 2 状语从句的连接词
(3) 强调句型：It is/was not until ... that ...
It was not until the professor came that we began the experiment. 直到教授来了，我们才开始做实验。 易错点：（1）till不可以置于句稿首定，PP而T until可以。 Until you told me I had no idea o稿新f定，itP上.P千T，款海模量板素选材择持总续有更一 直到你告诉我，我才知道这件事款适。合你
It’s three years since he joined the army.(自从......多久了......)
自从他参军已经三年了。
稿定PPT
稿定PPT，海量素材持续更
It's two years since we arrived新h，e上re千. 款我模们板选到择这总有儿一两年了。 款适合你
连词
常用句式
before It will be＋一段时间＋before ... 过……时间才……
since
It will not be/was not long＋before ... 不久就会/没多久就…… It was＋时间段＋befo稿稿r定e定P.P.P.TP，过T海了量素…材…持续(时更 间)才…… It is/has been＋一段时新间，上＋千s款in模c板e选..择. 总(从有一句用一般过去时)
as soon as / no sooner … than / hardly … when / the moment / the minute /（一…就…) since （自从…以来）
知识点2：状语从句的连接词 No. 1 时间状语从句 1．when, while, as 引导的时间状语从句
初中英语状语从句讲解及典型例题
状语从句在复合句中，用作状语的从句叫状语从句。
状语从句根据它表达的意义可以分为：时间状语从句、地点状语从句、原因状语从句、结果状语从句、让步状语从句、条件状语从句、目的状语从句、比较状语从句、方式状语从句。
（1）时间状语从句引导时间状语从句的连词或短语有：when, while, as, before, after, since, until, as soon as, once, each time, next time等。
1.When引导的时间状语从句When引导时间状语从句时，意为“当....时”，表示主句的动作与从句的动作同时或先后发生。
例：When you are doing your homework, you must be careful.Someone knocked（敲）at the door when I was sleeping.When she first saw the robot, she felt astonished（惊讶）.When Tom got home, he wept with anger.注意：when引导的时间状语从句中的动词可以是延续性的，也可以是非延续性的。
2.while引导的时间状语从句while引导的时间状语从句，意为“与...同时；在...期间”例：They entered the room while we were discussing problems.Father was cleaning the car while I was playing computer games.When she was in college, she felt in love with Mike.注意：while引导的时间状语从句中的动词必须为延续性或者表示状态的动词。
3.as引导的时间状语从句as引导的时间状语从句，表达“正当...，一边...一边...”强调主从句动作同时发生。
初中英语语法之状语从句类型及考点讲义
初中英语语法之状语从句类型及考点讲义状语从句概念解析状语从句指句子用作状语时，起副词作用的句子，可以修饰谓语、非谓语动词、定语、状语或整个句子，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，是英语复合句学习的一个重点，在各类考试中都会经常出现，这次就来给大家讲解一下什么是状语从句。
1. 时间状语从句：常用引导词：when, as, while, as soon as, before, after, since , till, until特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner … than, hardly …when, scarcely … when instantlyI ran into the classroom as soon as the bell rang.2. 地点状语从句:常用引导词：where特殊引导词：wherever, anywhere, everywhereWherever the sea is , you will find seamen.3. 原因状语从句:常用引导词：because=in that, since=now that, as, for特殊引导词：seeing that, now that, in that, considering that, given thatI 'm late because I didn't caught the bus.4. 目的状语从句：常用引导词：so that, in order that特殊引导词： for fear that（唯恐/生怕），in the hope that, for the purpose that, to the end thatYou should book the hotel in advance so that the travel will be more easy.5.结果状语从句：常用引导词：so … that, such … that特殊引导词：such that, to the degree that, to the extent that, to such a degree thatHe is so young that he can't have meal by himself.6. 条件状语从句：常用引导词：if, unless,特殊引导词：as/so long as（只要）, only if, providing/provided that（倘若）, supposing that（倘若）, in case that（以防）, on condition thatYou can go to London as long as you have passport.7.让步状语从句：常用引导词：though, although, even if, even though特殊引导词： as(用在让步状语从句中必须要倒装)，while，no matter …， in spite of the fact that, whatever, whoever, wherever, whenever, however, whichever, as if=as thoughThough we are old, we still can do these by ourselves.8. 比较状语从句：常用引导词：as(同级比较), than(不同程度的比较)特殊引导词：the more …the more …; just as …，so…,no … more than; not A so much as BShe is as pretty as her mother.9. 方式状语从句：常用引导词：as, as if, how特殊引导词：the wayHe didn't so it the way his brother did.辨析：while，when，as三者引导的时间状语从句时间状语从句算是状语从句中最简单的一类，也是我们日常生活交流中最常用的一类，虽然难度不大，但引导词也不少，仍然有不少同学会弄混那几个常见引导词的用法，这次就为大家带来as，when，while这几个词的辨析方法，一起看看吧。
初中英语知识点归纳状语从句的分类和用法
初中英语知识点归纳状语从句的分类和用法状语从句是英语语法中重要的一部分，它用来修饰主句的动作或描述情况的，在句子中起着状语的作用。
状语从句分为时间状语从句、条件状语从句、原因状语从句、目的状语从句、结果状语从句、方式状语从句和比较状语从句等。
下面将对初中英语中常见的状语从句分类和用法进行归纳。
一、时间状语从句时间状语从句用来表示动作或事件发生的时间，包括连词when (当...时候)，while (在...时候)，before (在...之前)，after (在...之后)，as (当)，since (自从)，until (直到)等。
时间状语从句一般放在主句之前或者之后。
例如：- When I was young, I used to play soccer with my friends. (当我年轻的时候，我常常和朋友们踢足球。
)- After she finished her homework, she went to bed. (她完成作业之后，去睡觉了。
)二、条件状语从句条件状语从句用来表示主句动作的条件或前提，包括连词if (如果)，unless (除非)，in case (以防)，as long as (只要)，provided/providing (只要)等。
条件状语从句一般放在主句之前。
例如：- If it rains tomorrow, we will stay at home. (如果明天下雨，我们就在家呆着。
)- Unless you work hard, you won't pass the exam. (除非你努力学习，否则你就不能通过考试。
)三、原因状语从句原因状语从句用来表示主句动作或情况的原因，包括连词because (因为)，as (因为)，since (因为)，for (因为)，now that (既然)等。
原因状语从句一般放在主句之前。
例如：- Because it was raining, we stayed at home. (因为下雨，我们呆在家里。
初中英语状语从句知识点总结
初中英语状语从句知识点总结状语从句是英语语法中的一个重要部分，它用来修饰或限定主句中的动作或状态。
以下是初中英语状语从句的知识点总结：1. 时间状语从句（Time clauses）：用来表示动作发生的时间，常用的连词有when, while, before, after, until, as soon as等。
2. 地点状语从句（Place clauses）：用来表示动作发生的地点，常用的连词有where, wherever等。
例如：I will go wherever you go.（无论你去哪儿我都会跟随。
）3. 原因状语从句（Cause clauses）：用来表示动作发生的原因，常用的连词有because, since, as等。
4. 结果状语从句（Result clauses）：用来表示动作的结果，常用的连词有so, such...that等。
例如：The movie was so interesting that I couldn't stop watching.（这部电影太有趣了，我看得停不下来。
）5. 条件状语从句（Condition clauses）：用来表示动作发生的条件，常用的连词有if, unless, provided that等。
例如：If it rains, we will stay at home.（如果下雨，我们会呆在家里。
6. 目的状语从句（Purpose clauses）：用来表示动作的目的，常用的连词有in order that, so that等。
例如：I bought a new notebook so that I can take notes in class.（我买了一个新笔记本，这样我可以在课堂上记笔记。
）7. 方式状语从句（Manner clauses）：用来表示动作发生的方式，常用的连词有as, as if, as though等。
例如：He speaks as if he knows everything.（他说话的样子就像他什么都知道。
初中英语状语从句
例题
• She told me__________story that we all forgot about the time.
• A） such an interesting B） such interesting a
• C） so an interesting D） a so interesting • (全国高考，1988，A对。)她给我们讲了一个
as 意义时,有些名词词组如 the moment， the
instant， the minute， the day， the year， every
time， next time, each time 等也用来引导时间状语
从句
• E.G. The mother didn't go to bed until her little daughter returned home last night. 昨晚母亲等到 她的小女儿回家才睡觉。
状语从句
(副词性从句)
目录
• 状语从句定义 • 状语从句分类 • 状语从句翻译 • 状语从句比较 • 其他从句概况
状语从句的定义
• 状语从句由从属连词(subordinating conjunctions)引导。
• 注意状语从句与主句之间的逻辑关系，选择正确的连 词;有些连词能引导多种状语从句。
•
返回
表示结果
• 九、结果状语从句 • 可以由 so that， so...that，
such...that 引导,这类从句也可以理解为 表示程度的状语从句: • E.G. He was so angry that he left the room without a word. 他很生气,一句 话不说就离开了房间。
初中英语中考常考状语从句整理汇总(共9类)
中考英语常考状语从句1.时间状语从句When/while/as, since, as soon as, until/till, before, after，once, by the time, the minute/ the moment(一...就...), every/each time, whenever,...(1) When & while &as①When:表示“当...时”，后面跟时间点、时间段均可，因而从句的动词可以是非延续性动词(又叫短暂性动词)或延续性动词。
例如：He was watching TV when his mom came back.当他妈妈回来时，他正在看电视。
When his mom was cooking, he was watching TV.当他妈妈做饭的时候，他正在看电视。
②While:表示“当..时”，后面只能跟时间段，因而从句的动词也只能是延续性动词，且常为进行时态（现在进行时或过去进行时）。
例如：While his mom was cooking, he was watching TV.当他妈妈做饭的时候，他正在看电视。
③as:表示“一边...一边...”【注意】与while区分：当一个人同时进行两个动作时(即主从句的主语是同一个人时)，只能用as。
还可表示“随着...”。
例如：Tom sings as he works. Tom一边唱歌一边工作。
As time went by, I learned how to be strong.随着时间的流逝，我学会了如何变得坚强。
(2) until & till (介词/连词)until:表示“直到...”，表示某个动作或状态一直持续到...为止。
例如：They waited until/till their mom came back.他们一直等到妈妈回来。
（主句谓语动词为延续性动词）“not...until”表示“直到...才”。
初中英语复习15-状语从句
初中英语复习—状语从句ltzzjr状语从句有：1.时间状语从句2. 条件状语从句3. 原因状语从句4. 结果状语从句5. 让步状语从句6. 地点状语从句7.比较状语从句8. 目的状语从句9.方式状语从句中考常考的是前5种（一）时间状语从句：由when, while, before, after, since, as soon as, till / until 引导的从句1）when与whilewhen + 短暂性动词/ 延速性动词的进行时态while + 延速性动词（一般是进行时态）eg.(1). I’ll tell her the good news _________he comes back.(2). Aunt Wang came in while we ________________ (watch) TV.(3). 当他做作业时，总是听音乐。
He always listens to music when/while _____ _____ _____ _______.(4).当我和Mike交谈时，电话响了。
The phone rang ______/_______ I _______ _______ ______Mike.= I _______ _______ ______Mike ______ the phone rang.2) until 的两种句式：短暂性动词或延速性动词的否定式+ until "直至某时才做某事"。
延速性动词的肯定式+ until "做某事直至某时"。
考试中阅读理解题中的理解替换：“The little girl didn’t fall asleep until her mother came home.”means ____.(多选)A.The girl got to sleep before her mother came home .B.The girl got to sleep after her mother came home .C.The girl kept awake before her mother came home .D.The girl kept awake until her mother came home .(1)直到他妈妈回来，我们才离开。
初中英语状语从句
初中英语状语从句一、时间状语从句时间状语从句表示时间，引导词有：when, while, as, till, until before, after, since等。
时间状语从句的引导词所表示的意思不尽相同，要注意把握不同引导词所表示的不同时间关系，以及它在具体句子中对应的时态、语态等问题。
注意：as（在……时候，因为），since（自从，因为），它们可以引导时间从句，并强调主句和从句的动作同事发生。
并且while有时还可以表示对比。
例如：（1）While my mother was reading the newspaper, I was watching TV.(read是延续性的动词，read和watch同事发生) I like playing football while you like playing basketball.我喜欢踢足球，而你喜欢打篮球。
（对比）（2）when（当……的时候），引导的从句的谓语动词可以是延续性动词，也可以是瞬间动词。
从句动作可与主语动作同事发生，也可在其后发生。
I was reading a book when she came into my room.(come是瞬间动词，只能用when引导，不能用while)I often missed my home when(while) I lived in NewYork. （live是延续性动词，when可用while代替）（3）when和while的区别还在于：while引导的时间状语从句多用于进行时态，而when引导的时间状语从句多用于一般时态。
While they were talking, the bell rang.正在他们谈话的时候，上课铃响了。
（4）as译作“一边……一边”、“随着……”，侧重主句和从句的动作同时发生。
有时可与when，while通用。
We always sing as we walk.我们总是边走边唱。
初中英语状语从句详细讲解与练习(精华版)
对比训练 1
1. __A__ he heard this, he got very angry.
2. I met Lucy__B__ I was walking along the river.
3. __C__ a child, he lived in the countryside. A. when B. while C. as
4. 表示“随着…..”.常指一个行为是另一个行为的结果。 As she grew older, she became more beautiful.
while:持续性动词 ／进行时
1.一般或现在情况
e.g. I like listening to music while I am doing my homework 2.将来. 情况－V一般现在时或现在进行时 e.g.— I’m going to the post office.
won in the end.
A. After B. before C. when D. then
since引导的时间状语从句
1.常译为“自从……”， 2.主句常用现在完成时，从句常用一般过去时。
1.我们自从分手以后一直没见过面。 We haven’t seen each other since we parted. 常用句型：It has been (is) + 时间段 + since从句
-- While you are there, can you get some stamps for me?
3.过去情况
e.g. I hurt my should while I was doing gym.
When: 1.当…的时候 When I was young, I went to town myself. When he receives the letter, he’ll tell us.
初中英语九种状语从句归纳总结
初中英语九种状语从句归纳总结一、时间状语从句（Time adverbial clauses）时间状语从句用来表示一个动作或事件发生的时间。
常见的引导词有：when（当…时候）、while（当…的时候）、as（当…时候）、before （在…之前）、after（在…之后）、since（自从…以来）、until（直到…为止）、as soon as（一…就…）、whenever（无论何时）等等。
例如：- She likes to listen to music while she is cooking.（她喜欢一边做饭一边听音乐。
）- He went to bed after he finished his homework.（他做完作业后去睡觉了。
）二、地点状语从句（Place adverbial clauses）地点状语从句用来表示一个动作或事件发生的地点。
常见的引导词有：where（在哪里）、wherever（无论在哪里）等等。
例如：- I will meet you at the place where we first met.（我会在我们第一次见面的地方见你。
）三、方式状语从句（Manner adverbial clauses）方式状语从句用来表示一个动作或事件发生的方式。
常见的引导词有：as（以…方式）、as if（好像）、as though（好像）等等。
例如：- She sang the song as if she was performing on stage.（她唱歌的时候好像在舞台上表演一样。
）- He spoke English as though he was a native speaker.（他讲英语好像是母语一样。
）四、原因状语从句（Reason adverbial clauses）原因状语从句用来表示一个动作或事件发生的原因。
常见的引导词有：because（因为）、as（因为）、since（因为）、as long as（只要）等等。
初中英语语法大全——状语从句(共24张PPT)
Kathy is so lovely that we all like to play with her.
He made so many mistakes that he failed the exam once again.
Such a little boy has so little difficulty in working out this problem that I admire him very much.
3、since的用法
(1) since意为“自从....”, 主句常用现在完成时或般现在时 ， 从句常用一般过去时。 eg: I have lived in England since I was three. 自3岁起 我就一直住在英国。 eg: It is two years since I became a college student. 我成为一名大学生已经两年了。
二、地点状语从句
在句子中充当地点状语的从句称为地点状语从句。引 导地点状语从句的从属连词主要有where( ...地 方), wherever(无论问处)等，表示地点方位。 eg: I found all the missing things where I left t hem. eg: Where there is a will, there is a way.
2. such...that...的用法
在such... that... 结构中，such是形容词，修饰名词或名词短语。引导 结果状语从句时，常用于以下结构:
a(n)+形容词+单数可数名词
so+ such+ 形容词+复数可数名词
+that+从句
状语从句(23张PPT)初中英语专项复习课件
时间状语从句的引导词
when while as
when, while, as：当…时
①既可以加持续性动词也可以加终止性动词 ②从句动作与主句动作可同时发生也可先后发生
When he arrived all the guests had left. Mary was having dinner when I saw her.
让步状语从句
though和although的用法 （1） 两词用法基本相同，although更加正式一些 （2） even though结构中的though不可以换为although （3） 两词不可与but连用，但是可以和yet, still连用
Though/although she works very hard, she makes slow progress. Though/although she is young, she has travelled to many countries.
条件状语从句
If the weather is terrible next week, we will put off the meeting. As long as you promise to come, I will wait for you. You will be late unless you hurry up. In case it rains, do not expect me.
3. such + 形容词+不可数名词+ that…
This was such fine music that it was worth listening to it again.
比较状语从句
1.在复合句中起比较状语作用的从句称为比较状语从句
初中英语语法 状语从句
初中英语语法状语从句初中英语语法状语从句1状语从句在复合句中，修饰主句中的动词、形容词或副词等的从句叫状语从句。
状语从句根据它表达的意思可分为时间、地点、原因、目的、结果、让步、比较(或方式)和条件等类。
1.时间状语从句引导连词有when，while，till，not…until，since，after ,before ,as soon asThe bus won’t start until everybody gets on.公共汽车直到每人都上车为止，才开动。
When he knocked at the door I was cooking.当他敲门时，我正在煮饭。
Last night before he came back home, his wife had already cooked dinner and waited for 2 hours.昨天晚上在他回到家之前，他的妻子已经做好晚饭足足等了他两小时之久。
After I went to church, I went shopping.2.地点状语从句地点状语从句通常由where, wherever 引导。
Where there is a will, there is a way. 哪里有志向，哪里就有出路。
有志者事竟成。
Where there is a life, there is a hope. 哪里有生命，哪里就有希望。
留得青山在，不怕没柴烧。
Wherever you go, whatever you do, I will be right here waiting for you.不管你去哪里，不管你做什么，我都会在此守侯你。
3.原因状语从句引导连词有because，as, since。
He didn′t see the film because he had seen it.他没有看那部电影，因为他已经看过了。
They couldn’t get on the train，for it was too crowed.比较：because, since, as和for1)because语势最强，用来说明人所不知的原因，回答why提出的问题。
初中英语语法-状语从句
whenever 无论何时
till/ until 直到
every/ each time 每次
instantly/ directly 一…就
When “当……的时候” 既可指时间段，也可指时间点 从句中既可用延续性动词，又可用非 延续性动词（终止性动词） 动作既可和主句的动作同时发生，又可在主句的动作之前或之后发生
Strike while the iron is hot.
需要之时方知友
我猜，我猜猜猜
趁热打铁 All things are difficult before they are ready.
万事开头难 A friend is never known till a man has need.
一寸光阴一寸金
状语从句 Adverbial Clause
Jennifer Hu
目 录
CONTENTS
什么是状语？
He speaks English very well.
（动词）
（形容词）
You are very beautiful.
（程度副词）
用来修饰动词，形容词，副词以及全句的句子成分，叫做状语。adverbial modifier (adv.)
3
1
【注意】anywhere副词，但可引导从句，相当于连词，意思相似于wherever, anywhere引导的从句,
2
可在主句之前或之后。 而wherever本身就是个连词，表示“在何处，无论何处”。
3
句型2：Anywhere/ wherever＋地点从句，＋主句。
4
Wherever the sea is , you will find seamen.
状语从句(29张PPT)初中英语专项复习课件
初中英语专项复习
状语从句是指句子的状语由一个从句充当， 用来 修饰主句中的动词、形容词或副词等。状语从句由从 属连词引导， 与主句连接， 放在句末时， 一般不在 前面加逗号。状语从句根据它表达的意思可分为时间 、原因、条件、比较、结果、目的等类型。
一、状语从句的种类
状语从句 的种类
引导词
)
color looks terrible.
He ran as fast as he
as＋原级＋ as… could to the top of
比较状语 比较级＋than＋ the hill.
从句 比较对象
John swims better
than Jim does.
状语从句 的种类
引导词
例句
He spoke so fast that
5. when, while, as意为“当……的时候”。 (1)when表示在某一特定的时间点(段)，主句的动作和
从句的动作同时发生或先后发生。when引导的时间 状语从句的谓语动词既可以是非延续性动词，也可 以是延续性动词。如： When we lived in town, we often went to the theatre. 我们住在城镇里的时候常去剧院看戏。
last night. 昨晚直到12点我回来他才停止工作。
7. as soon as… 意为“一……就……”， 强调主句的动 作紧接着从句的动作。如：
As soon as I arrive in Beijing, I will call you. 我一到达北京就会打电话给你。 8. so… that, such… that意为“如此……以至于……”， 引导结果状语从句。基本规则是：so后面接形容词 或副词， such后接名词。但有几点要特别注意： (1)such是形容词， 它所修饰的名词可以是可数名词， 也可以是不可数名词；名词前面可以带形容词， 也 可以不带。如果其后是单数可数名词， 前面需加不 定冠词a或an。因此， such… that… 的句型结构可 分为以下三种：
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初中英语状语从句【考点直击】1. 时间状语从句2. 条件状语从句3. 原因状语从句4. 结果状语从句5. 比较状语从句6. 目的状语从句7. 让步状语从句8. 地点状语从句【名师点睛】用来修饰主句中的动词，副词和形容词的从句叫状语从句。
根据其含义状语从句可分为时间状语从句，地点状语从句，条件状语从句，原因状语从句，结果状语从句，比较状语从句，目的状语从句，让步状语从句。
1. 时间状语从句(1)时间状语从句常用when, as, whil e, before, after, since, till, until, as soon as等连词来引导。
例如：It was raining hard when got to school yesterday.Whil e he was doing his homework, the tel ephone rang.As he walked al ong the lake, he sang happily.He had l earned a littl e Chinese before he came to China.After he finished middl e school, he went to work in a factory.(2)在时间状语从句里，通常不用将来时态，用现在时态表示将来的动作或状态。
例如：I’ll ring you up as soon as I get to New York.I will tell him everything when he comes back.He won’t believe it until he sees it with his own eyes.(3)在带有till或until引导的时间状语从句的主从复合句里，如果主句用肯定式，其含义是“一直到……时”，谓语动词只能用延续性动词。
如果主句用否定式，其含义是“直到……才……”, “在……以前不……”, 谓语动词可用瞬间动词。
例如：The young man read till the light went out.Let’s wait until the rain stops.We won’t start until Bob comes.Don’t get off until the bus stops.2. 条件状语从句(1)条件状语从句通常由if, unl ess引导。
例如：What shall we do if it snows tomorrow?Don’t l eave the buil ding unl ess I tell you to.(2)在条件状语从句里，谓语动词通常用现在时态表示将来的动作或状态。
例如：I’ll help you with your English if am free tomorrow.He won’t be late unl ess he is ill.(3)“祈使句+ and (or)+ 陈述句”在意思上相当于一个带有条件状语从句的复合句。
例如：Hurry up, or you’ll be late.=If you don’t hurry up, you’ll be late.Study hard and you will pass the exam.=If you study hard, you will pass the exam.3. 原因状语从句(1)原因状语从句通常由because, since, as引导。
例如：He didn’t come to school because he was ill.As it is raining, we shall not go the zoo.Since you can’t answer the question, I’ll ask someone else.(2)because表示直接原因，语气最强。
Because引导的原因状语从句多放在主句之后。
回答由why提出的问题，只能用because。
As和since语气较弱，一般用来表示明显的原因。
由as和since引导的原因状语从居多放在句首。
例如：------Why aren’t going there?------Because I don’t want to.As he has no car, he can’t get there easily.Since we have no money, we can’t buy it.(3)because和so不能同用在一个句子里。
4. 结果状语从句(1)结果状语从句由so…that, such…that, so that引导。
例如：He is so poor that he can’t buy a bike for his son.She is such a good teacher that everybody likes her.My pencil fell under the desk, so that I coul dn’t see it.(2)so…that语such...that可以互换。
例如：在由so...that引导的结果状语从句中，so是副词，与形容词连用。
其结构是: “...so + 形容词（副词）+ that + 从句”。
例如：He was so glad that he coul dn’t say a word.The hall is so big that it can hol d 2,000 peopl e.Mother lives so far away that we hardly ever see her.在由such…that引导的结果状语从句中，such是形容词，它修饰的可以是单数或复数可数名词，也可以是不可数名词；名词前面可以带形容词，也可不带。
如果是单数可数名词，前面需加不定冠词a或an。
例如：It was such a hot day that nobody wanted to do anything.He had such l ong arms that he coul d almost touch the ceiling.He made such rapid progress that he did very well in the mid-term.有时上述两种结构是可以互换的。
例如：It was such a wonderful film that all of us wanted to see it again.=The film was so wonderful that all of us wanted to see it again.It is such an important match that nobody wants to miss it.=The match is so important that nobody wants to miss it.(3)如果名词前由many, much, littl e, few等词修饰时，只能用so, 不用such。
例如：Soon there were so many d eer that they ate up all the wil d roses.He has so littl e time that he can’t go to the cinema with you.5. 比较状语从句比较状语从句通常由as…as, 比较级+ than…等连词引导。
例如：Tom runs faster than John does.This classroom is as big as that one.6. 目的状语从句(1)目的状语从句通常由so that, in order that引导。
例如：We started early so that we coul d catch the first train.He studies hard so that he coul d work better in the future.We used the computer in order that we might save time.(2)so that既可引导目的状语从句，又可引导结果状语从句。
区别这两种从句的办法有两个：1)目的状语从句里往往带有情态动词can, coul d, may, might等。
2)从意思上看，目的状语从句往往表示的目的很明确。
例如：Speak cl early so that they may understand you. (目的状语从句)Jack is badly ill so that he has to rest. (结果状语从句)7. 让步状语从句(1)让步状语从句通常由although, though等连词引导。
例如：Though he is young, he knows a l ot.Although I am tired, I must go on working.(2)although(though)不能用在同一个句子中。
例如：我们不能说：Though it was raining hard, but he still went out.应该说：Though it was raining hard, he still went out.或It was raining hard, but he still went out.8. 地点状语从句地点状语从句常常由where来引导。
例如：Go where you like.Where there is a will, there is a way.【实例解析】1. (2004年北京市海淀区中考试题)You will stay healthy _______ you do more exercise, such as running and walking.A. ifB. howC. beforeD. where答案：A。
该题考查的是引导状语从句的从属连词的选择。
从意思上看，从句应是一个条件状语从句，在这四个选项中只有if能引导条件状语从句，所以选A。
2. (2004年江西省中考试题)---Shall we go on working?---Yes, _________ I prefer to have a rest.A. whenB. ifC. becauseD. though答案：D。
该题考查的是引导状语从句的从属连词的选择。