蓝Luckyclover
状语从句三要点，时间,原因和条件；从句如果表时间，after,before,when常用；状语从句表原因，because一马来当先；状语从句表条件，if前面来引导；主句通常前面走，从句紧紧跟在后。从句如在主句前，从句之后加逗点。
小也安安
一般来说，有三句口诀：“主现从任、主过从过、主将从现。”
意思是说：
另外，since 引导时间状语从句时，其主句通常要用现在完成时，有时也用现在完成进行时。如：
She has had another baby since I saw her last. 从上次我见到她以来，她又生了一个孩子。
He has grown an inch since I saw him. 我上次见到他以后他已长高了一英寸。
注：当主句为“It + be + 一段时间”时，则通常用一般现在时代替现在完成时。如：
It’s more than three years now since I saw her last. 我们已有三年多没见面了。
一些特定句式的时态：
特定句式的时态
由no sooner. . . than, hardly [scarcely]…when引出的时间状语从句，其主句通常用过去完成时，从句通常用一般过去时。如：
Hardly had he arrived when she started complaining. 他刚到她就抱怨起来。
No sooner had he gone to sleep than the telephone rang. 他刚睡着电话铃就响了。
We had no sooner set out than a thunderstorm broke. 我们刚出发就下起一阵雷暴。
No sooner had she agreed to marry him than she started to have terrible doubts. 她刚同意嫁给他她就开始产生可怕的疑虑。
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