这两句话都对吗?为什么?I finished my article yesterday evening when the

从句是瞬时性动作,主句应该用进行时或完成时,强调从句动作发生的一瞬间,主句主语正在做什么或已经做完什么.
I have finished my article yesterday evening when the light went out.当电灯熄灭时我已经做完了作业.
I was going to finish my article yesterday evening when the light went out.finish 没有进行时态,所以用将来时（实际也是进行的结构be going to,不能换成would)
当电灯熄灭时,我正要完成作业（快要完成了）.
类似的语句还有：
I was doing my homework when she came in.
她进来时我正在做作业.
I have arrived home when the rain stated.
下雨时我已经赶回家.

上对下错。