as soon as是英语连词短语，中文译为“一……就……”，常用于引导时间状语从句。该短语在口语和书面语中均可灵活使用，其句式位置具有可变性，适配多种时态结构。
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。