状语从句
1. 时间状语从句
没想到我如此浮躁It was raining hard（rain hard 下大雨） when got to school yesterday.
While he was doing his homework, the telephone rang. As he walked along（沿着走） the lake, he sang happily.
He had learned a little Chinese before he came to China. After he finished middle school, he went to work in a factory.
难点——as when while都是寂寞惹的祸的辨析
as when while都表示主、从句动作同时发生，三者差异如下：
表示“一边。。。一边＂的意思
as 强调两个动作同时进行，并表示对比时 ，用于发生时间较段时
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.
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.爱篮球
(当)whether是什么意思我到了电影院时，电影已经开演了。(从句的动作发生在主句之后，只能用when,并要注意时态)
He was about to leave, when the telephone rang.
他正要离开，忽然电话响了。( 此时不能放在句首。主句动词一般表达 “正在” “即将”. whil
e, as不能代替 考点)
She thought I was talking about her daughter, while, in fact, I was talking about my daughter.
他以为我在谈她女儿，然而，实际上在谈论我女儿。(表转折，对比，when, as都不能代替它) 考点
(2)在时间状语从句里，通常不用将来时态，用一般现在时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)在带有同情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（熄灭）.
Let’s wait until the rain stops.
We won’t start until Bob comes.
董鄂妃怎么死的Don’t get off（从下来） until the bus stops.
【Till是指直到某一特定事件发生的时候，而在那个时刻之后，该事情或状况仍将持续。 Until是指直到某一特定事件发生的时候，而讲话的人在自己心里认为，在那个时刻之后，该事情或该状况将中止（不怎么可能持续）。固定组合里from morning till night，till/until是不能替换的，】
2. 条件状语从句
(1)条件状语从句通常由if, unless引导。例如：
What shall we do if it snows tomorrow?
Don’t leave the building unless 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 unless 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（不得；不应该）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 couldn’t see it.
(2)so…that语hat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 couldn’t say a word. The hall is so big that it can hold 2,000 people. Mother lives so far away that we hardly ever（几乎不，从来不） 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 long arms that he could almost touch the ceiling.（天花板）
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, little, few等词修饰时，只能用so, 不用such。例如：
Soon there were so many deer that they ate up all the wild roses.
He has so little time that he can’t go to the cinema（去看电影） 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：
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