同学你好，该知识点来自沪江网校《新概念英语第二册【天猫专享】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好！
引导时间状语从句，no sooner用过去完成时，than用一般过去时。
例如：I had no sooner reached home than it began to rain.
我一到家天就开始下雨。
一般用倒装句表示强调；
例如
:No sooner had I reached home than it began to rain.

as soon as 一...就... 可以用在过去时态和一般现在时态中；
例如
As soon as I get some more I'll offer them up here again.
尽快正如我得到一些更多，我会再次在这里为他们提供服务；

They telegraphed me to go as soon as possible.
他们打电报给我，叫我赶快走。