(after a verb or adjective) one who (is) ...
(after a noun) person involved in ...
-er
-ist
(used after a number or 后hòu [后] or 前qián [前] to refer to sth mentioned previously)
(used after a term, to mark a pause before defining the term)
(old) (used at the end of a command)
(old) this
a surname
denoting a portion
this
these
yes, yes! (exclamation)
you (informal, as opposed to courteous 您nín [您])
can be used to refer to an unspecified person