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；
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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.
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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)
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例：我一见到他就会告诉他这个消息。
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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.
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He fainted as soon as he heard/had heard the news.
