as soon as 引导的是时间状语从句,表示“一...就...”。As soon as如果表将来发生的动作，主句用将来时，as soon as 引导的从句要用一般现在时，即“主将从现”原则。指过去发生的动作的话，主句和从句都要用过去时。
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)
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本文概览：as soon as 引导的是时间状语从句,表示“一...就...”。As soon as如果表将来发生的动作，主句用将来时，as soon as 引导的从句要用一般现在时，即“主将从现”原则。指过去发生的动作的话，主句和从句都要用过去时。