What's the difference between 不 and 没 I basically understand the difference between 不 and 没 that 不 is to negate future and habitual action while 没 is used for the complete action. But my teacher gave a sentence: 我没有去過美國, which I don't think it explains a past event and it makes me confused how to use 没 and 不. Please help me to figure this out. Thank you!