要知道状语从句的引导词，首先要弄清楚什么是状语和状语从句。说明动词发生的时间、地点、原因、方式、目的、条件、结果、比较、让步等的，就是状语。所以状语从句的引导词一定是有九种情况。有引导词引导的部分就是状语从句，没有引导词引导的就是主句。下面分九种情况给大家介绍状语从句。
一，时间状语从句的引导词有when, while, after, before, as（当……时候）, as soon as, once, until, till, since（自从……到现在），by the time 到...时候。一定要注意主句和从句的时态。
When my father came back last night, I was doing my homework.昨晚我爸回来的时候，我在做作业。
When we got to the station, the train had left. 当我们到达车站的时候，火车已经走了。
My son went to buy a bag of salt while I was cooking in the kitchen. 我在厨房做菜的时候，儿子去买了一包盐。
By the time we arrive at the station, the train will have left. 等我们到达车站的时候，火车将已经开走了。
After I had finished my homework, I went to bed. 我完成家庭作业后，就睡觉了。
Before I went to college, I had lived with my grandparents. 我上大学之前是和爷爷奶奶住在一起的。
As Tom was a child, his family was very poor.汤姆小时候，家里很穷。
As soon as I get home, I will tell my parents about it. 我一到家，就把此事告诉我父母。
Once ice gets heated, it becomes water. 冰一旦被加热，就变成水。
I will wait until the rain has stopped. 我要等到雨停。
I won't leave till the rain stops. 我要雨停了我再走。
I have lived in Kunming since I began to work. 我从开始工作到现在一直住在昆明。
二，地点状语从句的引导词就是where
where主谓，表示在主语做某事的地方
I will go to work where my hometown needs me. 我要到家乡需要我的地方去工作。
Put your book where you can find it. 把书放在你能找到的地方。
Where there is a will, there is a way. 有志者事竟成。
Where we had the party, there was a big tree. 在我们举办晚会的地方，有一颗大树。
三，原因状语从句的引导词有because, for, since（既然）as，now that
Tom didn't come to school yesterday because he was ill. 汤姆昨天没有来上学，因为他生病了。
It rained last night, for it's wet on the ground. 昨晚下雨了，因为地上湿的。
Since everyone is here, let's begin our meeting. 既然大家都来了，我们就开会吧。
As the little girl was frightened, she stood there still. 那个女孩有点害怕，她地站在那儿一动不动。
Now that you are ill, you can rest at home. 既然你不舒服，你可以在家休息。
四，目的状语从句引导词有so that, in order that，in case
Let's get up at six tomorrow so that we can catch the early bus. 我们每天六点起床吧，以便我们每天赶上早班车。
In order that I can pass the math exam, I am going to study hard from today on.为了数学考试及格，从今天开始，我要努力学习了。
Take an umbrella with you in case it rains. 把伞带上，万一下雨。
五，比较状语从句引导词有than, as...as，the same as
My brother is taller than I am. 我弟弟比我高。
Mary is as good at Chinese as Lucy. 马丽和路西语文一样好。
I am not as good at math as Mary. 我的数学没有马丽学得好。
I have the same schoolbag as Jack. 我和杰克有个一样的书包。
六，结果状语从句引导词有so...that, such...that
The little boy is so short that he can't get the apple on the tree. 那个小男孩如此矮，他够不着树上的苹果。
Tom is such a tall boy that he can get the apple on the tree.汤姆是个如此高的男孩，他能摘到树上的苹果。
七，条件状语从句引导词有if, unless
If it rains tomorrow, I won't go to the park. 如果明天下雨，我就不去公园了。
Unless it rains tomorrow, I will go shopping with you. 如果明天不下雨，我就和你一起去购物。
八，方式状语从句引导词是as
You must write the homework as Mary did yesterday. 你们必须按照马丽昨天做的那样做。
Do as the Romans do when in Rome.入乡随俗。
九，让步状语从句的引导词有although（though）even if, whatever, however, whichever, whenever, wherever, whoever，no matter what, no matter how, no matter which, no matter when, no matter where, no matter who，as
Although the girl is only seven years old, she can take care of herself. 小女孩虽然只有七岁，但是她能照顾自己了。
Tom and I are best friends. Even if he doesn't have much money, he is willing to help me. 汤姆和我是最好的朋友。即使他钱不多，他也很愿意帮我。
Whatever happens, I will give you a hand. 不管发生什么，我都会助你一臂之力。
Whenever you need help, call me. 不管什么时候需要帮忙，给我打电话。
Wherever you go, I will follow you. 不管你走到哪里，我都跟着你。
Whichever book you give me,it's good.不管你拿哪本给我，都是好书。
However fast you drive, we are safe. 不管你开车多快，我们都是安全的。
Whoever you are, I won't open the door. 不管你是谁，我都不开门。
No matter who you are, I won't open the door. 不管你是谁，我都不开门。
Child as the boy is, he can speak English very fluently. 那男孩虽然是个小孩，但是他的英语说的很流畅。
人教版中学英语教材上，学生必须掌握的状语从句的引导词应该是这些了。如果还有其它的引导词，最好作为课外拓展词汇。
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这个故事真是有趣啊，没想到连学习语法也能变成一个童话故事！
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原来中学英语的重点语法这么重要，这故事让人印象深刻。
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这个标题太有创意了，让语法瞬间变得生动起来。
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