具體用法：
1、指未發生的動作。時態規律是“主將從現”，即主句用一般將來時，從句用一般現在時代替一般將來時。
I’ll tell him the plan as soon as I see him.
我一看到他就告訴他這個計劃。
He’ll go home as soon as he finishes his work.
他一完成工作就回家。
I’ll write you as soon as I get there.
我一讀完就把書還回去。
2、如果強調過去發生的兩個動作有先后關系，從句謂語動詞可以用過去完成時。例如：
As soon as they (had) returned from London, they drove to see their sick aunt.
他們一從倫敦回來，就開車去看望他們患病的姨媽。
After left as soon as he had drunk his coffee.
Andrew一喝完咖啡就走了。