I was watching TV when mother came in.
这里一定要用was doing哦,因为是在过去的一段时间你刚好在看电视。一定要用过去进行时哦~
祝你学习进步~英语越来越好哦~望采纳~
I'm watching TV when my mother comes in.
Mom came in when I was watching TV.
When my mun comes in,I am watching TV.
The mother came in when I was watching TV