状语从句用法小结
时间状语从句 when, while, as, before, since, once， after, as soon as, till, until, not…until, the first/cond…/last time, the moment, the minute, the instant, immediately, directly, instantly, hardly…when, scarcely…when, no sooner…than (一…就…)
地点状语从句 where, wherever
原因状语从句 becau, since, as,for, in that,(由于，因为)now that, （既然） eing that,（ 因为）
条件状语从句 if, unless, now (that), as(so) long as, as (so)far as,in ca, on condition that,
suppo/supposing, provided/providing =if
让步状语从句 although, though, even though/if, as, while,
no matter which/what/when/where/who/how, whichever, wherever, whatever, whoever, whenever, however, whether…or是…还是不是;不管…还是；无论…还是
结果状语从句 so that, so…that, such…that
目的状语从句 so that, in ca, for fear that, lest（唯恐, 以免, 免得）
方式状语从句 how, as, as if/as though (好像)
比较状语从句 than, as…as, not so/as…as, the +比较级…, the +比较级…
考点与难点：1、各种从属连词的含义及用法比较；
2、no matter wh- 与 wh-ever 引导的从句的区别；
3、状语从句的时态问题；
4、状语从句倒装及紧缩问题；
5、状语从句与其它从句的区别。
时间状语从句 when, while, as, before, since, after, as soon as, till, until, not…until, the first/cond…/last time, the moment, the minute, the instant, immediately, directly, instantl
y, hardly… when, scarcely…when, no sooner…than (一…就…)
原因状语从句 becau, since, as,for, in that,(由于，因为)now that, （既然） eing that,（ 因为）
一、 when常见考点
1、“当……时候”， 引导时间状语从句。
When he was a young man， he was fond of hunting.
It was already 10:00PM，when I finished the work.
2、“正在那时，这时”等于and at that time，引导并列句。常用于以下三种句型里。
We were having a meeting when someone broke in.
We were about to leave when it began to rain.
He had just gone a mile when it began to rain.
3、“既然”等于since 或considering that， 引导原因状语从句。
It was foolish of you to take a taxi，when you should/could easily walk there in five min
utes.
How can they learn anything when they spend all their spare time watching TV?
4、“虽然，然而，可是”引导让步状语从句。常用于句中，不用于句首。
He usually walks when he might ride.
They had only three chairs when they need five.
二、 while常见考点
1、“当……时候”， 引导时间状语从句（从句动作必须是延续性的）。（有时表对比）
Plea don’t talk so loud while others are working.
While I was cleaning the window， my finger was riously cut.
2、“虽然，尽管”相当于although，引导让步状语从句（常把while放在句首）。
While she is a top student， she has some shortcomings.
While the Internet is bridging the distance between people， it may also be breaking some home or will cau other family problems.
3、“而，然而”，表对比或相反的情况。
He likes pop music，while I am fond of folk music.
Kids talk frequently about what they can do，while many adults do the opposite， tending to talk about what they can’t .
4、“只要，如果”等于as long as，引导条件状语从句。
There is hope while there is life.
While you study hard， your effort will pay off.
三、 as常见考点
1、“一边……一边”或“随着……”，引导时间状语从句（as引导的从句内部的动作与主句内动作同步）。
John sings as he works. （一边……一边）He read as he walked.
Jame’s blindness was getting wor as he was getting older.（随着……）
注意as当随着讲时，一般可转换成with结构。
As winter comes, the weather is getting colder and colder.
With+n+to do/doing/done
With winter coming, the weather is getting colder and colder.
2、“因为”， 引导原因状语从句。(表示听话人已知的原因)
As you weren’t there， I left a message.
3、“尽管，即使，虽然” 引导让步状语从句（用于形容词，副词或名词后构成部分倒装）。
Young as I am， I already know what career I want to follow.
Much as I like you， I couldn’t live with you.
Child as Tom is ， he has been a success.
其它as意义：1. 按照，像；（连词） 2. 作为（介词）；3.一样地（副词）4。 正如（关系词，引导非限制性定语从句）
注意： as a boy=When he was a boy 不存在as he was a boy
1． Do as I tell you。
2． As a teacher, I should be strict with you.
3． He is as tall as I.
4． As is known to all, the earth goes round the sun.
特别注意:as从句中不可用be动词!错:As he was a kid, he ud to help his father with the farm work.
对:When / While he was a kid, he ud to help his father with the farm work.
对:As a kid, he ud to help his father with the farm work. 5）Child as he is, he can speak three languages.
till, until和not…until：
1. until/till引导时间状语从句用于肯定句时，主句的动词是延续性动词，表示动作或状态一直持续到until/till所表示的时间，意为“某动作一直延续到某时间点才停止”。如：
We waited until he came.
2. 用于否定句时，主句谓语动词是非延续性动词，从句为肯定，意为“某动作直到某时间才开始”。如： He won’t go to bed till/until she returns.
3. till不可以置于句首，而until可以。如： Until you told me I had no idea of it.
4. not…until句型中的强调和倒装说法：
It was not until you told me that I had any idea of it.
Not until you told me did I have any idea of it.
连接词before的小结：
一、含义 :1) 在…之前 2）之后才，之后就（从前往后译）3）趁…还未来得及
1． We had sailed four days and four nights before we saw land.
2． We hadn’t run a mile before he felt tired.
3． Plea write it down before you forget it.
4． Before I could get in a word, he had measured me.
二．Before从句中谓语不用否定式。如：
Before they reached the station, the train had gone.
三．1）句型It will be/was＋段时间＋before…“还要过多久才……”
如：It will be two years before he leaves the country.
2）句型It will be/was not＋一段时间＋before…“不多久就……”
如： It wasn’t two years before he left the country.
3）句型It is(has been)/was＋段时间＋since…时间的计算一律从since从句的动作完成或状态结束时算起。如：
It is three years since she was in the army.
Itwas three years since she had joined the army.
连接词since的小结：
1) 引导时间状语从句，意为“自从…时起”
I have been teaching English since I graduated from university.
牢记以下两大标准句型：
A） It is/has been+段时间+since引导的过去时的句子
It is three years since we met last time.
It is three years since he was ill.
注意：since后跟延续性动词，应理解为自从该动作结束时算起。
B） It was+段时间+since引导的过去完成时的句子
2) 引导原因状语从句，意为：“既然”
Since you are ill, you should go to e the doctor..
Once: 一旦A…., B就….
Once SA+P(一般现在时/现在完成时)+SB+P(一般现在时/一般将来时)
