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一、原因状语从句
(1)
原因状语从句通常由
becau
se, since, as, for
引导。
(2)because
表示直接原因，语气最强。
b
ecause
引导的原因状语从句多放在主句之后。回答由
wh
y
提
出的问题，只能用
because
。此外，
because
和
so
不能同用在一个句子里。
例如：
------
Why
aren’t going
there?
------
Because I don’t
want to.
since
引导原
因状语从句，相当于
now that
，意思是
“
因为
……
，既然
……
，
鉴于
……
”
。
例如：
Since the
rain has stopped
，
let’s go
for a walk.
既然雨停了，我们出去散散步吧。
as
和
si
nce
语气较弱，
一般用来表示明显的原因。
< br>由
as
和
since
引导的原因状语从居多放在句首。
例如
：
As
he has no car, he can’t get there
easily.
Since we have no money, we
can’t buy it.
(4)for
< br>表示所说的理由是一种补充说明
,for
引导的从句一般
不放在句子的开头。如
:
I decided to
stop and have lunch, for I was feeling quite
hungry.
练习：
I was
late for class yesterday _______ there was
something wrong with my bike.
He took
off his coat _______ he felt hot.
you can’t answer the question, I’ll ask
someone
else.
二、结果状语从句
(1)
结果状语从句由
so…that, such…that, so
that
引导。
(2)so…tha
t
语
such...that
可以互换
。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.
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；其结构是
:
“...such +a / an +
形容词
+
名词
+ that +
从句
”
。
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）
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.
(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 with you.
(4)<
/p>
如果主从句的主语相同，并且从句是否定的形式，可以用
too.
..to...
句型转化。
例如：
He was so excited that he
couldn't go to sleep that night. = He was too
excited to go to sleep.
(5)
如
果主从句的主语相同，但从句是肯定的形式，可以用
adj.+
enough
替换。
例如：
He is so old that he
could go to school. = He is old enough to go to
school.
他够大了，可以去上学。
练习：
It is ___ hot
in the room ___ we have to go out for a walk.
It was
a wonderful movie
all
of us wanted to see it again.
There were
little water in the bottle
the bird
couldn’t reach it.
.
.
三、目的状语从句
1
(1)
目的状语从句通常由
so that, in order
that
（为了，以便）引导。
例如：
We started early so that
we could catch the first train.
We used the computer in
order that we might save time.
(2)so th
at
可引导目的状语从句，此时可用
to
或
in order to
替换
,<
/p>
将其改为简单句。
例如：
He got up early so that
he could get to school on time.
=He got up
early
（
in
order
）
to get to
school on time.
(3)so that
既可
引导目的状语从句，又可引导结果状语从句。区别这两种从句的办法有两个：
1)
目的状
语从句里往往带有情态动词
can,
could, may, might
等。
2)
从意思上看，目的状语从句往往表示的
目的很明确。
例如：
Speak clearly
so that they may understand you.
(
目的状语从句
)
Jack is badly ill so that
he has to rest.
(
结果状语从句
)
练习：
I hurried
I wouldn't be late for class.
We should go by
bus ___ we can get there earlier.
May I sit nearer
I
can see more clearly?
(4)
补充：
so as to
…
(
肯定结构
)
eg. He got up early so as to catch the
early train.
so
as not
to…
(
否定结构
)
eg.
He got up early so as not to miss the
early train.
to
…
eg. He got up early to catch the early
train.
in order that
…
eg. He got up early in order that he
could catch the early train.
in order
to
…
eg. He got up
early in order to catch the early train.
状语从句强化练习
2