从属连词
从属连词通常引导一个从句
修饰主句
一般可分为引导名词性从句（宾语从句或表语从句等）和引导状语从句的从属连词
(1) 引导名词性从句的从属连词主要有that，if（是否），Whether（是否）等
I don't know if he'II come today．
我不知道他是否会来。
（引导宾语从句）
The problem is that we haven't got enough money.
问题是我们没有足够的钱。
（引导表语从句）
(2)引导状语从句的从属连词有很多
时间状语从句
when，while，as，after，before
until，till , as soon as
They had left
当我到那里时他们已经离开了。
地点状语从句
where
wherever
Where there is a will, there is a way．
有志者，事竞成。
原因状语从句
because
since
as（因为）
now that
I drove slowly because there was such heavy traffic.
我开得很慢，因为车太多了。
条件状语从句
if ( 如果 )
unless
once（一旦）
in case
We'll go fishing if it doesn't rain tomorrow．
如果明天不下雨，我们就去钓鱼。
目的状语从句
in order that
so that
I got up early so that I could catch the first bus.
我起得很早，为的是赶上第一趟车。
让步状语从句
although / though
even if / though
however
Though Canada is large, the population is small。
尽管加拿大面积大，人口却很少。
结果状语从句
so…that
so that
such…that…
He was so tired that he fell asleep fast.
他累得很快就睡着了。
比较状语从句
than
as / so…as…
less / more…
I'm older than you.
我年龄比你大。
方式状语从句
as（按照）
if / though（好像）
You should do as l told you．
你应该按我说的做。
不能同时出现在一个句子中的连词
1、besause（因为）, so（所以）
不能同时出现在一个句子里
只能用其一
Because he was tired, he couldn't walk there.
=He was tired, so he couldn't walk there.
因为他累了，所以他不能走到那儿了。
2、(al)though（虽然）, but（但是）
不能同时出现在一个句子里
只能用其一
但 though 和 yet 可以同时出现在一个句子里（yet用作副词）
Though he was tired, he still worked hard.
=He was tired, but he still worked hard.
虽然他很累，但他仍然努力工作。
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