I am watching TV when suddenly my mother comes in.
我正在看电视，妈妈突然进来了。
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。
I will watch TV when suddenly my mother comes in.
我即将去看电视，妈妈突然进来了。
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。
I was going to watch TV when my mother came in.
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