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as soon as引导的时间状语从句的规则：若主句为一般将来时，从句常用一般现在时表将来；若主句不是一般将来时，那么从句的时态就要根据上下文来定。
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.
注：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
不过,我也见过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.
as soon as的例句
He felt shame as soon as he had spoken .
话一出口，却又觉得挺丢人的。
I'll ask her as soon as she slows down .
要她稍稍闲下来，我就会问她。
I remarked the heat as soon as i entered the room .
一进房间就觉得热。
The atmosphere changed as soon as she walked in .
她一进来气氛就变了。
When you are ill , see the doctor as soon as possible .
有病要及早治。
I recognized him as soon as i saw his back .
我一看到后身，就认出是他。
I shall spirit up the colonel as soon as i can .
我要尽快地给上校打气。