1、The lights were all on.
灯都亮着。
2、The TV is always on in their house.
他们家的电视总是开着。
3、We were without electricity for three hours but it's on again now.
我们停电三个小时了，不过现在又来电了。
4、There was a war on at the time.
当时正值战争。
5、What's on at the movies?
电影院在上演什么片子？