我正在做作业，突然所有的灯都熄灭了。

I was doing my homework, suddenly all the lights went off.

youdao

我刚做完作业，突然灯全灭了。

I had just finished my homework when all the lights went out.

youdao

我刚做完作业，突然灯全灭了。

I had just finished my homework when all the lights went out.

youdao