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状语从句的引导词及用法总结状语从句是在复合句中充当状语的从句，它由引导词和从句构成。
状语从句的引导词主要有时间、原因、条件、结果、目的、让步、方式、比较等词语。
下面将对这些引导词及其用法进行总结。
1. 时间状语从句时间状语从句用于描述事件发生的时间，常用的引导词有when （当...时候）、while（当...的时候）、before（在...之前）、after（在...之后）、since（自从）、until（直到）、as soon as（一...就）等。
例如：- I will call you when I arrive home.（当我到家时，我会给你打电话。
）- She likes to read while she is waiting for the bus.（她喜欢在等车的时候读书。
）- After they finished dinner, they went for a walk.（他们吃完晚饭后出去散步了。
）2. 原因状语从句原因状语从句用于表示某个行为或情况发生的原因，常用的引导词有because（因为）、since（因为）、as（因为）、due to（由于）等。
例如：- She couldn't come to the party because she was sick.（她因为生病所以不能来参加派对。
）- He couldn't concentrate on his work since he was tired.（他因为累了无法集中精力工作。
）- As it was raining heavily, we decided to stay at home.（由于下着大雨，我们决定待在家里。
）3. 条件状语从句条件状语从句用于描述某种条件下的情况，常用的引导词有if（如果）、unless（除非）、as long as（只要）、provided/providing that（只要）、in case（万一）等。
八种状语从句状语从句在句中作状语，修饰主句中的动词、形容词和副词等。
按其作用和意义可分为时间、原因、目的、结果、条件、让步、方式、比较八种。
下面对这八种从句的要点加以总结。
一、各类状语从句的引导词及易混词的区别。
1. 时间状语从句1) 引导词（1）表示“当……时候”：when, while, as, whenever（2）表示“一……就……”：as soon as（3）其它：after, before, since, until, by the timeWhenever he comes, he brings a friend. 他每次来都带个朋友。
I want to see him as soon as he arrives. 他一来我就要见他。
I went to bed after I finished my homework. 我做完家庭作业之后才睡觉。
2) 易混引导词when, while, as 的区别when既可指“时间点”，与瞬时动词连用，也可指“时间段”，与延续性动词连用（这时可与while互换）。
如：When he came in, his mother was cooking. 他进来时，他妈妈正在烧饭。
When（While）we were at school, we went to the library every day. 我们在校求学时，每天都到图书馆去。
while 只表示时间段，因此while从句的谓语动词要用延续性动词。
Please don' t talk so loud while others are talking. 别人在工作时，切勿大声讲话。
as 与when 用法相似，但着重强调主句动作与从句动作同时发生，有“随着……”或“一边……一边……”之意。
She sang as she went along. 她边走边唱。
As you get older, you get more knowledge.随着年龄的增长，你获得的知识就越多。
九大状语从句的英文表达1. 时间状语从句 (Adverbial clause of time):- When he arrived, everyone was already there.- I will call you as soon as I finish my work.2. 地点状语从句 (Adverbial clause of place):- Wherever she goes, she always takes her camera.- I will meet you at the park where we used to play.3. 原因状语从句 (Adverbial clause of cause/reason):- Since it"s raining, we should stay indoors.- The game was canceled because of bad weather.4. 结果状语从句 (Adverbial clause of result):- The car broke down, so we had to call for a tow truck. - He studied really hard, therefore, he got excellent grades.5. 条件状语从句 (Adverbial clause of condition):- If it rains, we will have to cancel the picnic.- Unless you hurry, you will miss the train.6. 目的状语从句 (Adverbial clause of purpose):- I am studying hard so that I can get into a good university.- He took extra classes in order to improve his English speaking skills.7. 方式状语从句 (Adverbial clause of manner):- She wrote the letter as if she was in a hurry.- They danced like nobody was watching.8. 比较状语从句 (Adverbial clause of comparison):- She is taller than I am.- He runs faster than his brother.9. 消息状语从句 (Adverbial clause of reported speech): - He told me that he would be late for the meeting.- She said that she was feeling tired.。
状语从句（原因，目的，结果状语从句）概念以及句型特点(1)概念：状语从句在复合句中作状语，修饰主句中的动词、形容词、副词等。
(2)句型特点状语从句可以放在主句之前，也可以放在主句之后。
放在主句之前时，常用逗号与主句分开；放在主句之后时，不用逗号。
3. 从属连词及引导的状语从句. 从属连词：引导状语从句的一、原因状语从句(1)原因状语从句通常由because, since, as, for引导。
(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。
此外，because和so不能同用在一个句子里。
例如：------Why aren’t going there?------Because I don’t want to.（3）since引导原因状语从句，相当于now that，意思是“因为……，既然……，鉴于……”。
eg：Since the rain has stopped，let’s go for a walk.既然雨停了，我们出去散散步吧。
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：As he has no car, he can’t get there easily.Since we have no money, we can’t buy it.(4)for表示所说的理由是一种补充说明,for引导的从句一般不放在句子的开头，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。
:I decided to stop and have lunch, for I was feeling quite hungry.课堂随练用as,for ,sine,because填空1.I was late for class yesterday_____________ there was something wrongwith my bike.2.He took off his coat ___________ he felt hot.3.____________ you can’t answer the question, I’ll ask someone else.4._________he was ill, he didn’t go to school.5._______ you do not understand, I will explain again.6. ____she was late for class, she had to say sorry.7. He must be ill, _____he is absent today.8. I eat potatoes _________I like them.我吃土豆是因为我喜欢土豆。
状语从句九大类型及例句一、时间状语从句1、从句中常用引导词：When, after, before, as, as soon as, till, until, while 等。
2、例句：When we got home, dinner was ready.二、条件状语从句1、从句中常用引导词：If, unless, provided, on condition that, as/so long as等。
2、例句：I will go out with you if you promise to be back by 10.三、地点状语从句1、从句中常用引导词：Where, wherever等。
2、例句：Where there's a will, there's a way.四、原因状语从句1、从句中常用引导词：Because, since, as, now that, now that等。
2、例句：He can't work since he is ill.五、结果状语从句1、从句中常用引导词：So that, so..that, such...that, that等。
2、例句：They worked so hard that they succeeded in the end.六、让步状语从句1、从句中常用引导词：Though, although, even though, whatever, whichever等。
2、例句：Though it rained heavily, the sports meeting went on.七、比较状语从句1、从句中常用引导词：Than, as, as...as, not so...as等。
2、例句：You ought to work harder than you do now.八、方式状语从句1、从句中常用引导词：As, as if, as though, like等。
中考专项原因状语从句和结果状语从句第一：原因状语从句是一个从句，用来表达一个事件或行为发生的原因。
它通常由连词because（因为）、since（既然）、as（由于）、for（因为）等引导。
下面是这四个引导词在原因状语从句中的例子：1. because（因为）：- I couldn't attend the party because I was feeling unwell.（我没能参加聚会，因为我感觉不舒服。
）- They canceled the trip because of the bad weather.（他们取消了旅行，因为天气不好。
）2. since（既然）：- Since it's raining heavily, we should stay indoors.（既然下着大雨，我们应该待在室内。
）- He hasn't been exercising since he injured his leg.（自从他腿部受伤后，他就没再锻炼过。
）3. as（由于）：- As she was tired, she decided to take a nap.（由于她累了，她决定小睡一会儿。
）- They couldn't finish the project on time as they faced unexpected challenges.（由于面临意外挑战，他们不能按时完成项目。
）4. for（因为）：- He was late for work, for his car broke down on the way.（他上班迟到了，因为他的车在路上抛锚了。
）- She couldn't concentrate in class, for she had a headache.（她无法集中精力上课，因为头疼。
）第二：because的用法：连词"because"用于引导一个原因状语从句，用来解释或说明某个事件或行为发生的原因。
