状语从句分类及常用连词
一、状语从句分类及常用连词：
类别 连 词
地点状语从句 where,wherever
时间状语从句 when, whenever, while, as, before, after, since, till, once, as
soon as,etc.
原因状语从句 because, since, as, for, now that, etc.
目的状语从句 in order that, so that, that, etc.
结果状语从句 so…that, so that, such…that, that, etc.
条件状语从句 if, unless, as(so)long as, etc.
让步状语从句 though, although, even if, even though, however, whatever, as,etc.
比较状语从句 as…as, so…as, than, etc.
方式状语从句 as, as if, as though, etc.
二、各种状语从句的连词的用法区别
1 地点状语从句
地点状语从句通常由where, wherever 引导。
Where I live there are plenty of trees. 我住的地方树很多。
Wherever I am I will be thinking of you. 不管我在哪里我都会想到你。
2 方式状语从句
方式状语从句通常由as, (just) as…so…, as if, as though引导。
1） as, (just) as…so…引导的方式状语从句通常位于主句后，但在(just)
as…so…结构中位于句首，这时as从句带有比喻的含义，意思是"正如…"，"就像"，多用于正式文体，例如：
Always do to the others as you would be done by.
你希望人家怎样待你，你就要怎样待人。
As water is to fish, so air is to man.
我们离不开空气，犹如鱼儿离不开水。
Just as we sweep our rooms, so we should sweep backward ideas from our
minds.
正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。
2） as if, as though
两者的意义和用法相同，引出的状语从句谓语多用虚拟语气，表示与事实相反，有时也用
陈述语气，表示所说情况是事实或实现的可能性较大。汉译常作"仿佛……似的"，"好像……似的"，例如：
They completely ignore these facts as if (as though) they never existed.
他们完全忽略了这些事实，就仿佛它不存在似的。（与事实相反，谓语用虚拟语气。）
He looks as if (as though) he had been hit by lighting.
他那样子就像被雷击了似的。（与事实相反，谓语用虚拟语气。）
It looks as if the weather may pick up very soon.
看来天气很快就会好起来。（实现的可能性较大，谓语用陈述语气。）
说明：as if / as though也可以引导一个分词短语、不定式短语或无动词短语，例如：
He stared at me as if seeing me for first time.
他目不转睛地看着我，就像第一次看见我似的。
He cleared his throat as if to say something.
他清了清嗓子，像要说什么似的。
The waves dashed on the rocks as if in anger.
波涛冲击着岩石，好像很愤怒。
3 原因状语从句
比较：because, since, as和for
1）because语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。
I didn't go, because I was afraid.
我没有去，因为我害怕。
Since /As the weather is so bad, we have to delay our journey.
自从天气这么糟糕，我们不得不推迟我们的旅行。 因为天气大家都是显而易见的，所以可以用AS或SINCE代替。
2）由because引导的从句如果放在句末，且前面有逗号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。
He is absent today, because he is ill. 他今天缺席，因为他病了。
He must be ill, for he is absent today. 他一定病了，因为今天他缺席。
由BECAUSE引导的从句放在句末，且前面有逗号，可用FOR代替。
4 目的状语从句
表示目的状语的从句可以由that, so that所以, in order that, lest唯恐，以免,
for fear that唯恐，害怕, in case万一等词引导，例如：
You must speak louder so that /in order that you can be heard by all.
你必须说话大声点，因此我们大家都可听得见。
He wrote the name down for fear that(lest) he should forget it.
他由于恐惧而写下名字以免忘记。
Better take more clothes in case the weather is cold.
BETTER带多一点衣服以防天气变冷。
5 结果状语从句
结果状语从句常由so… that 或 such…that引导，掌握这两个句型，首先要了解so 和 such与其后的词的搭配规律。
比较：so和 such
其规律由so与such的不同词性决定。such 是形容词，修饰名词或名词词组，so 是副词，只能修饰形容词或副词。 so 还可与表示数量的形容词many, few, much, little连用，形成固定搭配。
so foolish那样愚蠢 such a fool 这么个
so nice a flower such a nice flower
so many / few flowers such nice flowers
so much / little money. such rapid progress 这样快速进步
so many people such a lot of people象这么多的人
（ so many 已成固定搭配，a lot of 虽相当于 many，但 a lot of 为名词性的，只能用such搭配。）
so…that与such…that之间的转换既为 so与such之间的转换。
The boy is so young that he can't go to school. 这个男孩年龄太小而不能上学。
He is such a young boy that he can't go to school. 他这么个小男孩还不能够上学。
6 条件状语从句
连接词主要有 if, unless如果不，除非, as/so long as, on condition that 等。.
if 引导的条件句有真实条件句和非真实条件句两种。非真实条件句已在虚拟语气中阐述。
unless = if not.
Let's go out for a walk unless you are too tired. 如果你不累的话让我们出去走走。
If you are not too tied, let's go out for a walk. 如果你不太累让我们出去去去。
型例题
You will be late ___ you leave immediately.
A. unless B. until C. if D. or
答案A。 句意：除非你立即走，否则你就回迟到的。可转化为 If you dong leave immediately, you will be late. B、D句意不对，or表转折，句子如为 You leave immediately or you will be late.
7 让步状语从句
though, althoughwhatever什么意思
注意： 当有though, although时，后面的从句不能有but，但是 though 和yet可连用
Although it's raining, they are still working in the field.
虽然在下雨，但他们仍在地里干活。
He is very old, but he still works very hard.
虽然他很老，但仍然努力地工作。
Though the sore be healed, yet a scar may remain.
伤口虽愈合，但伤疤留下了。 （谚语）
典型例题
1） ___she is young, she knows quite a lot.
A. When B. However C. Although D. Unless
答案：C。意为虽然她很年轻，却知道许多。
2) as, though 引导的倒装句
as / though引导的让步从句必须表语或状语提前（形容词、副词、分词、实义动词提前）。
Child as /though he was, he knew what was the right thing to do.
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