I was doing my homework.My mother came back.合并为一句
问题描述：
I was doing my homework.My mother came back.合并为一句
答
I was doing my home work whem my mother came back.
答
while I was doing my homework ,my mother came back .
I was doing my homework when my mother came back
答
While I was doing my homework ,my mother came back .
I was doing my homework when my mother came back .
The moment my mother came back, I was doing my homework.
答
My mother came back while I was doing my homework
答
When I was doing my homework,my mother came back