ABC Chinese–English Comprehensive Dictionary (2003). I can't access the "slightly revised through July 2005" ed. p 253.
I understand copulas for English, but not for Chinese here. Anyways, let's focus on the negatory meanings of 非 and 不 Disregard their unique (like 5-7 for both entries above). 非 and 不 can both mean "not". So how do they differ?
- If so, please see this question's title.