1、 I am watching TV when suddenly my mother comes in.
我正在看电视，妈妈突然进来了。
2、 I am going to watch TV when suddenly my mother comes in.
我正要去看电视，妈妈突然进来了。
3、 I will watch TV when suddenly my mother comes in.
我即将去看电视，妈妈突然进来了。
4、 I was watching TV when suddenly my mother came in.
我刚刚在看电视，这时妈妈突然进来了。
2、when造十个句子
