英语as的用法Just as I was opening the front door,the telephone ra

as:在什么时候,正好怎么样;引导状语从句,表伴随,两个动作同时进行
句型是be doing as be doing
did as be doing
as 还可以引导原因状语从句
as ...as表示和什么什么一样
用法挺多的,是我自己写的,你可以下一个有道桌面字典,里面很全