when引导的时间状语从句 从句可以用进行时吗
问题描述：
when引导的时间状语从句 从句可以用进行时吗
我记得有一个图表,好像是：
延续性动词（ ）延续性动词
延续性动词（ ）短暂性动词
短暂性动词（ ）延续性动词
短暂性动词（ ）短暂性动词
括号里填when或while或when&whlie皆可
答
when 既可以和延续性动词连用,也可和非延续性动词连用.
When / while / As I was walking in the street ,it began to rain .
I was coking when someone knocked on the door .
While I was doing my homework ,my mother was watching TV .
We sang as we walked along .
While I was doing my homework , my mother was watching TV .
When / while / I was walking in the street , it began to rain .
When he came in , I was reading the newspaper.
When she heard the sad new, she began to cry .