"为什么你没有告诉我?"
Translation:Why didn't you tell me?
November 19, 2017
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没有 is used for past tense negation, while 不 is used for present (and future), so "why don't you tell me" would be "为什么你不告诉我" (I'm not a native speaker though so someone please correct me if there's any other issue with that sentence!) https://resources.allsetlearning.com/chinese/grammar/Bu_and_mei(you) lays it out nicely with some more examples. :)