什么时候复合句中会用到主将从现的用法.举例说明

题目

什么时候复合句中会用到主将从现的用法.举例说明

答案

在含时间状语从句及条件状语从句的复合句中.
I will tell him about it as soon as he comes back .
What will you do if it is sunny tomorrow?