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1、1.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。

2、　　例：晚会刚一开始他就离开了。

3、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)　　例：他一听到那个消息就晕倒了。

4、As soon as he heard/had heard the news, he fainted.　　He fainted as soon as he heard/had heard the news.　　2.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。

5、　　例：我一见到他就会告诉他这个消息。

6、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。

7、　　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。

8、　　I will tell him as soon as I see him.As soon as I see him I will tell him.不标志着什么时态as soon as 是指尽快地去做那个动作，比较一下：he runs there as soon as he can，他一旦可以（跑）就马上往那儿跑了。

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