非
fēi
I adv.
1) not
2) coll. have got to; simply must
我非去！ I simply must go.
II b.f.
1) mistake; error; wrong; evildoing
2) not conform to; run counter to
3) censure; blame
III pref.
not; no; non-; un-
IV ab.
Africa
V cons.
1) 非 ... bùkě//bùchéng//bùxíng: must ...; will inevitably ...
我非去不可。 I have to go.
2) 非 A 非 B: neither A nor B
非驴非马 nondescript
3) 非 A jí B: either A or B
非黑即白 either black or white
4) 非 A cái B: B only if A
非他说才行。 It'll only work if he says so.