1、表示选择关系的并列连词
表示选择关系的并列连词有：or, either…or…,whether… or…等。
1)or：或、否则
A:基本用法
or 表示 “或” 的意思，使用于两者之中选择一个的时候。
----Is your friend English or American? ----American.
He doesn’t like dumplings or noodles.
B:特别用法
祁使句后连接or ，表 “如果…,否则…”,有转折的意思，此时 or =if you don’t …,you’ll …
Hurry up, or you’ll be late.=If you don’t hurry up, you’ll be late.
2)either…or…:或者…或者…; 不是…就是…;要么…要么…
A. either…or…连接两个并列主语时,谓语动词靠近哪个主语就与哪个主语保持 “人称”和 “数”的一致，即就近原则。
Either you or I am right.
Does either she or they like English?
B. 由either…or…引导的否定句是完全否定。
She isn’t either a student or a teacher.
3)whether…or…不管…还是…
She is always cheerful, whether at home or at school.
2、表示因果关系的并列连词
表示因果关系的并列连词有：for(因为)，so(所以)。
He is not at school today, for he has a bad cold.
It was late, so I went home
3、引导让步状语从句的从属连词
引导让步状语从句的从属连词有：although/though(虽然，尽管), even though/if (即使)
Although/ Though it is a very young country, it is very rich.
Even if/ though you were here yesterday, you couldn’t help him.
注意：although/though 引导的从句不能与but连用，但可与yet, still连用。
4、引导结果状语从句的从属连词
引导结果状语从句的从属连词有：so that(结果是)和so/such…that…(如此…以至于)等。
It was very cold, so that the water in the bowl froze.
He got there so early that he got a good seat.
It is such a heavy box that nobody can move it.
更多了解：高三英语
