连接词的作用不容忽视，词虽简单常见，但是却串联起了一个个句子，让句与句之间的关系不同，或因果相连，或意思更进一步……
下面我们从从句的角度了解下连接词：
1.名词性从句
关系代词：what,who,whom,which
关系连词：that,when,where,how
2.形容性从句
关系代词：that,who,whom,whose, which,as
关系连词：where,when,why,how
3.副词性从句
时间状语从句
when,while,as,before,since,till,
until, as soon as
①一些时间名词：the moment, the instant, the minute, the day, next time, every time
②一些副词：instantly，immediately，directly
③固定搭配的连词：no sooner...than, hardly...when, scarcely...when
地点状语从句
when
wherever, anywhere, everywhere
原因状语从句
because，as, for, since
seeing that, considering that, now that, given that, in that, in as much as, in so much as
目的状语从句
so that, in order that, that
lest, for fear that, in case, in the hope that, on purpose that, for the purpose that, to the end that
结果状语从句
so...that, so that, such...that
such that, to the degree that, to the extent that, to such a degree that, to such an extent that
条件状语从句
if, unless
suppose, supposing, providing, provided(特别关注：supposed, provide不用作条件从句的连词)， on condition that, so long as, as long as
让步状语从句
although, though, even though, even if
while(一般用在句首)， as（用于倒装结构)，whatever, whoever, whichever, however, whenever, wherever, whether...or..., as+adj.+as+主谓结构（句首)
比较状语从句
as, than
the more...,the more...;just as..., so...;A is to B what/as C is to D; no more...than; not A so much as B/not so much A as B
方式状语从句
as, the way
