中文为：一……就……；一经；不久后，一会儿。既可以引导时间状语
从句，表过去，又可以表示将来。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。
这个
短语用的比较常用,
口语和
书面语都可以.它的特点是,在句子中的位置比较灵活,而且可以用于各种时态。
如：I will tell him the news as soon as he comes back.
注：有时,为了特意表达刚刚完成某事就如何如何,需要用
现在完成时如：I will go with you as soon as I have washed my face.
如 He took out his English books as soon as he sat down.
如：As soon as he finishes his classwork, he runs
out of the class.他一做完
课堂作业，就跑出了教室。