可

可 (kě) currently has the following grammatical points associated with it:

• Expressing permission with "keyi" (A1)
• Two words for "but" (A2)
• Emphatic adverb "ke" (B2)
• Expressing "no" (noun) "to" (verb) with "wu... ke..." (B2)
• Expressing “must" with "feidei" (C1)

Not what you're looking for? Check the wiki page for ke or search for 可