turn off the lights after he has finished drawing 中的after能不能改为if?

可以Turn off the lights if he has finished drawing如果他完成了画画的话,把灯关掉(表示某人的要求,使如果他做了这件事的话,那么则怎样怎样...)Turn off the lights when he has finished drawing当他完成了画画...

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