引导时间状语从句的词有:when、whenever、as、while、before、after、until、till、since、eversince、nowthat、once、so long.....as、as long as、as soon as等。

when表示“正在这时、突然”,while引导时必定表示延续性的动作;
as引导时间状语从句表示同一个主语,They are talking as they are working;
before/after后不跟介词;
untile、till 同上用法;
eversince既可以跟介词,有可以跟连词;
now that(既然)表示原因从句;
*名词短语当做时间状语引导词相当于从属连词:
as soon as 等同于the instant、the moment、the minute、the second;
each time/every time/first time/last time;
the day/the month/the year you came here,the day you come here等同于when you come on the day.
2、表地点:where、wherever地点状语提前需带条件。
3、表原因:①becaues、as、since、nowthat、not that.....but that(不是因为...而是因为...)
②分词:seeing that、considering
③I'm glad that he has got a jod.
4、表目的:so that、in order that.
5、表结果:so that(后跟情态动词)、such...that,that.
6、表条件:If、unless、so long as、as long as、in case、so far as(就...而言)、on condition that.
7、表让步:though、although(后边永远不用倒装)、even if/though(可以倒装可以不倒装)、as引导让步状语从句必须倒装。
8、表比较:as....as,I ran as fast as you can.



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