如何对be doing sth when造句

问题描述:

如何对be doing sth when造句

I am go on a trip to xi'an when l finish my homework

恩。是不是这种
When I was doing my homework,my mother came home.

I was doing eighty when I overtook you.
我刚才是以每小时八十英里的速度追上你的.
What was Linda doing when Davy ran away?
当戴维跑开的时候,琳达正在做什么?