as soon as引导什么从句

　　as soon as引导时间状语从句，表示过去，也可以表示将来。as soon as的意思是：一……就……；一经；不久后，一会儿。例句：As soon as he got inside, the dog shook himself.他一进来，狗就开始摇头摆尾。

　　 as soon as 后面接什么时态

　　as soon as这个短语比较常用，口语和书面语都可以。它的特点是在句子中的位置比较灵活，而且可以用于各种时态。当指未发生的动作时，时态规律是“主将从现”，即主句用一般将来时，从句用一般现在时代替一般将来时。如果强调过去发生的两个动作有先后关系，从句谓语动词可以用过去完成时。

　　 as soon as的用法

　　1、指未发生的动作，规律是：主句一般将来时，从句用一般现在时代替一般将来时。如：I will tell him the news as soon as he comes back.有时，为了特意表达刚刚完成某事就如何如何，需要用现在完成时。如：I will go with you as soon as I have washed my face.

　　2、指紧接着发生的两个短动作，主从句都用一般过去时。如 He took out his English books as soon as he sat down.也有从句和主句都用一般现在时的情况。如：As soon as he finishes his classwork, he runs out of the class.他一做完课堂作业，就跑出了教室。

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