i don't know if she has turned off the light.为什么要使用现在完成时

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i don't know if she has turned off the light.为什么要使用现在完成时
i don't know if she has turned off the light.为什么要使用现在完成时

i don't know if she has turned off the light.为什么要使用现在完成时
强调"已经".翻译为:我不知道她是否已经关灯了.