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as soon as指未发生的动作，主句用一般将来时，从句用一般现在时替代一般将来时。指随后发生的2个短动作，主从关系句都用一般过去时。
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；
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。
一般来说as soon as前后的动词用主将从现，主句用一般将来时，从句用一般现在时。
例句：
1、As soon as we found this out,we closed the ward.
我们一发现此事就关闭了病房。
2、As soon as I had made the final decision,I felt a lot more relaxed.
我一作出最后的决定就感到轻松多了。
3、He got married as soon as he graduated.
他一毕业就结婚了。
as soon as 后面用什么时态
1.as soon as 可以表将来的事：这时主句用一般将来时，从句用一般现在。(主将从现)
例：我一见到他就会告诉他这个消息。
As soon as I see him I will tell him the news.
I will tell him the news as soon as I see him.(位于主句前后均可)
我一到北京就会给你打电话。
I will call you as soon as I arrive Beijing.
As soon as I arrive Beijing I will call you.
我一看到他就会告诉。
I will tell him as soon as I see him.
As soon as I see him I will tell him.
当主句用一般将来时时，可以用一般现在时代替一般将来时
2.as soon as引导时间状语从句当主句用一般过去时时，从句中用一般过去时或过去完成时。
例：晚会刚一开始他就离开了。
As soon as the party began/had begun he left.
He left as soon as the party began/had begun.(位于主句前后均可)
他一听到那个消息就晕倒了。
As soon as he heard/had heard the news, he fainted.
He fainted as soon as he heard/had heard the news.