when while as 引导的时间状语从句 不同点在哪 共同点在哪?

题目

when while as 引导的时间状语从句 不同点在哪 共同点在哪?

答案

When he was a child he was always trying out new ideas.他小时候就常常试验一些新的设想.when she came into my room I was just reading a book.她走进我房间时,我正在看书.Sorry,I was out when you called me....