as soon as意为“一……就……”，引导时间状语从句。

如：Please call back as soon as you arrive school.请你一到学校，就给我回电。I’ll write to you as soon as I get there.我一到那儿就给你写信。As soon as I went in, Tom cried out with pleasure.我一进门，汤姆就高兴的叫起来。as soon as 引导的时间状语从句前后时态搭配：(1) 主句为一般将来时，从句用一般现在时表示将来。例如：SHe will come to my home as soon as she gets to tianjin. 她一到天津就来我家。

（2） 主句为一般过去时，从句也用一般过去时。例如：SHe took out her English book as soon as she sat down. 她一坐下，就拿出她的英语书。as soon as引｜导时间状语从句意为'一…就…'， 其主从句的时态，也遵循'主将从现'原则。e.g. I will tell you as soon as he comes back.他一回来我就告诉你。下面的连词引导的时间状语从句，都遵循'主将从现'原则：when,while,after,as,until.e.g. They will never let you know until it happens.直到事情发生了，他们才会让你知道。When I grow up, I'll be a nurse and look after the patients.当我长大后，我要当一名护士去照顾病人。