○1 表联合关系连词。(and, or, but, for, not only…but also, as well as, both…and…, neither…nor .)
○2 转折连词。(but, while, yet, however .)
○3 选择连词。(or, or else, either…or…, otherwise .)
2.从属连词：
○1 引导主语从句、宾语从句和表语从句的连用，主要有三个：that, whether, if . I hear that he is a student .
○2 引导状语从句的从属连词：
A. 连接时间状语从句：when, before, after, while, as soon as, since, until, as, whenever, ever since …
B. 连接让步状语从句：although, though, even if, however …
C. 连接原因状语从句：as, because, since, now that, for …
D. 连接目的状语从句：that, so that, in order that …
E. 连接条件状语从句：if, unless, once, in case …
F. 连接结果状语从句：so…that, such…that …
G. 连接方式状语从句：as, as if, as though …
H. 连接地点状语从句：where .
I. 连接比较状语从句：as, as…as, not as/so …as, than …
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