引导条件状语从句的:if, unless, once, so (as) long as
引导结果状语从句的:so that , such that
引导目的状语从句的:so that , in order that
引导比较状语从句的:as as , not so (as) as , than
引导方式状语从句的:as if
引导主语,宾语或表语从句的连词主要有:that, whether, if三个。其中that 和whether间或还可以引起同位从句和状语从句。
(三)某些用法比较特殊的从属连词用法区别
1、当while, when, as引导时间状语从句时的区别:
①while引导的状语从句中动词必须是持续性。谓语动词多为进行时,或状态动词的一般时。while 的这些用法可用when代替,等于 at the time that, during the time that。例如:Please keep quiet while (when) others are studying;
② when除可指一段时间外,还可用来指一点时间,等于 at the time,也就是说when引出的时间状语从句中的谓语动词可以是终止性的,也可以延续性的。因此主句和从句的谓语可以是一般时,进行时,或完成时。例如:When I went into the lab, the teacher was doing an experiment.(when不能换成while)He often makes mistakes when he is speaking English.(when可换成while)
③as常可与when,while通用,但强调一边、一边。例如:As (when, while) I was walking down the street, I noticed a police car in front of number 37.
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