四、原因状语从句
要点: 由连词because, since, as, in that 引导, 也可由for, now that 等词引导
1. I didn’t go to school yesterday because I was ill.
我昨天没去上学，因为我生病了。
2. Since everybody is here, let’s begin our meeting.
既然大家都来了, 让我们开始开会吧.
3. As you are in poor health, you should not stay up late.
既然你身体不好, 你就不该熬夜.
4.I asked her to stay to tea,for I had something to tell her.
我请她留下来喝茶,因为我有事要告诉她.
for I had something to tell her.I asked her to stay to tea
注：for引导的从句不能放在主句前面。
五、目的状语从句
要点： 目的状语从句由连词so that, so…that…. , in order that , such…that,such that, only to, too….to…., in order to, so as to, lest, for fear that, in case (that) 引导。
1.so that 以至, 以便
1、I’ll run slowly so that you can catch up with me. (目的)
我将慢慢跑以至你能赶上我。
2、The boy is so young that he can’t go to school
这个男孩如此小以至于不能上学
3、He is such a clever boy that everybody likes him.
他非常聪明，大家都非常喜欢他。
4、His kindness was such that we will never forget him.
他待人那么厚道，我们永远不会忘记他
5、He returned after the war, (only) to find that his wife had left him.
他战后归来，只发现妻子已离他而去
6、The boy is too young to go to school.
这男孩年龄太小，不能上学。
7、I got up early this morning in order to catch the first bus.
我早早起床是为了赶上第一趟公共汽车
8、I got up early this morning so as to catch the first bus
9、in order that=so that:为了
We shall let you know the details soon in order that you can/may make your arrangements.
不久我们将会让你知道详情,以便你们能够做出安排。(目的)
10、in case (that), in case of 的of是介词，介词后面只能带名词性质的词，比如名词、代词等。意思和in case差不多，万一的意思 In case of rain they can't go.
11、Take an umbrella with you in case that it rain .带上一把伞，以免下雨
12、He worked hard for fear that he might be fired by the boss.
他拼命地干活惟恐被老板解雇。
Put on a coat for fear of catching a cold. 穿上外衣以免感冒。
比较：so和 such
其规律由so与such的不同词性决定。1、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。 2、so 还可与表示数量的形容词many, few, much, little(这四个形容词表多或表少时)连用，形成固定搭配。
so foolish /such a fool
so nice a flower /such a nice flower
so many / few flowers/ such nice flowers
so much / little money. /such rapid progress
so many people /such a lot of people
（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.
He is such a young boy that he can’t go to school
六、让步状语从句
要点: 表示让步的状语从句由连词 though, although引导.
though, although当虽然讲, 都不能和but连用. Although,(though)…but的格式是不对的.但是他们都可以同yet (still) 连用. 所以though ,(although)…yet(still)的格式是正确的.
Wrong: Although he is rich but he is not happy.
Right : Although he is rich, yet he is not happy.
虽然他很富有, 然而他并不快乐.
Right : Although we have grown up, our parents treat us as children.
Right : Although we have grown up, our parents still treat us as children.
尽管我们已经长大了,可是我们的父母仍把我们看作小孩.
1) 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.
= Though he was a small child, he knew what was the right thing to do.
注意：
a. 句首名词不能带任何冠词。
b. 句首是实义动词，其他助动词放在主语后。如果实义动词有宾语和状语，随实义动词一起放在主语之前。
Try hard as he will, he never seems able to do the work satisfactorily.
= Though he tries hard, he never seems…
2) "no matter 疑问词" 或"疑问词 后缀ever" whatever --no matter what
No matter what happened, he would not mind.
Whatever happened, he would not mind.
替换：no matter what = whatever
no matter who = whoever
no matter when = whenever
no matter where = wherever
no matter which = whichever
no matter how = however
注意：no matter 不能引导主语从句和宾语从句。
（错）No matter what you say isof no use now.
（对）Whatever you say is of no use now.
你现在说什么也没用了。(Whatever you say是主语从句)
（错）Prisoners have to eat no matter what they’re given,
（对）Prisoners have to eat whatever they’re given. 囚犯们只能给什么吃什么。
七、比较状语从句
比较状语从句(adverbial clause of comparison)从某种角度上说，它也是一种方式状语从句，它通常可和以下关联词来引导as(或so)...as, than,according as, in proportion as等。如：
肯定结构：as...as...否定结构not…so…as, not…. as…as
He woke up assuddenlyashe had fallen asleep. 他醒来得和入睡一样突然。(第一个as是副词)
I have never seen so much rain as fell that February. 我从未见过像那个二月那么多雨。(否定结构常用so…as, 也可用as... as)
than
Man developed earlier than people think. 人类的出现比人们所想的要早。
He moves more slowly than his sister does. 他行动起来比他妹妹慢。
The youth of today are better off than we used to be. 今天的年轻人比我们过去的境况要好。
according as
You may go or stay, according as you decide. 是去是留由你自己决定。
You will be praised or blamed according as your work is good or bad. 你受表扬还是责备得看你的工作好坏决定。
in proportion as比例
Men are happy in proportion as they are virtuous.
人之幸福与德行成正比。
Some people are happy in proportion as they are noticed.
有些人越受到注意就越高兴。
倍数表达法有三种：
倍数＋原级 倍数＋比较级 倍数＋名词短语
例如: 和---三倍一样长
1. three times as long as
2. three times longer than
3. three times the length of
再如：和---四倍一样宽
1. four times as wide as
2. four times wider than
3.four times the width of
3、no more than只不过(嫌少的意思)
1、I have no more than two pens.
我只有两支笔。
2、It’s no more than a mile to the shops.
去商店不过一英里。
not more than不如……；(前者不如后者)
1、Jack is not more diligent than John.
捷克不如约翰勤奋。
2、one of the 名词(复数)….之一(用于最高级)
Han Mei is one of the best students in our school.
韩梅是我们学校最好的学生之一。
八、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：
1、Always do to the others asyou would be done by.
你希望人家怎样待你，你就要怎样待人。
2、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。
3、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：
1、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。）
2、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。）
3、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。）
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