Simply B Jí Cái 非  ²fēi Adv Literary

 ²fēi adv. ① be not (literary) 这件事~你我能够解决。 This cannot be decided by either your or me.

②〈coll.〉(often used with bu)  have got to; simply must | buxing, wǒjintian ∼ qù!No,  I simply must go.there today.

◆b.f. ①mistake; error; wrong; evildoing (opp 是）

◆pref. not; no; non-; un-  ~政府 non-government

 ◆cons. ① ∼...bùkě/bùchéng/bùxíng    must ...; will inevitably ... | Wǒ ∼ qù bùkě. I have to go.

② ∼ A ∼ B   neither A nor B | ∼ lǘ ∼ mǎ nondescript

③ ∼ A jí B     either A or B | ∼ hēi jí bái either black or white

④ ∼ A cái B   B only if A | ∼ tā shuō cái xíng. It'll only work if he says.