I.要点
1、连词的种类
(1)并列连词用来连接并列关系的词、短语或分句，如and, for, or, both…and, either…or, neither…nor等。
(2)从属连词用来引导从句，如that, if, whether, when, after, as soon as等。
除了从属连词(引导状语从句)外，还有其它可以用来引导从句的词类。它们是连接代词和连接副词(引导名词性从句)，关系代词和关系副词(引导定语从句)。
2、常用连词举例
(1) and和，并且
They drank and sang all night.
(2) both…and和，既…也…
Both my parents and I went there.
(3) but但是，而
I'm sad, but he is happy.
(4) either…or或…或…，要么…要么…
Either you're wrong, or I am.
(5) for因为
I asked him to stay, for I had something to tell him.
(6) however然而，可是
At first, he didn't want to go there. Later, however, he decided to go.
(7) neither…nor既不…也不
Neither my parents nor my aunt agrees with you.
(8) not only…but(also)不但…而且…
He not only sings well, but also dances well.
(9) or或者，否则
Hurry up, or you'll be late.
Are you a worker or a doctor?
(10) so因此，所以
It's getting late, so I must go.
(11) although虽然
Although it was late, they went on working.
(12) as soon as一…就
I'll tell him as soon as I see him.
(13) because因为
He didn't go to school, because he was ill.
(14) unless除非，如果不
I won't go unless it is fine tomorrow.
(15) until直到…
He didn't leave until eleven. (瞬间动词用于not… until结构)
He stayed there until eleven.
(16) while当…时候，而(表示对比)
While I stayed there, I met a friend of mine. (while后不可用瞬间动词)
My pen is red while his is blue.
(17) for因为
He was ill, for he didn't come. (结论是推断出来的)
(18) since自从…
I have lived here since my uncle left.
(19) hardly… when一…就
I had hardly got to the station when the train left.
(20) as far as就…来说
As far as I know, that country is very small.
You may walk as far as the lake. (一直走到湖那里)