preposition, verb, adjective, adverb, noun · using a specific tool or method; by means of (coverb)

中国人习惯用筷子吃饭。

verb, adverb, preposition · to need or have to (typically used in negative sentences or questions)

不用担心，事情很快会解决。

verb, preposition, adverb, noun · to consume or utilize a resource (often used in contexts involving quantity or frequency of use).

他家人口多，每个月都要用很多电。

verb, adjective, particle, punctuation, noun, pronoun · usefulness or utility

这本书对他很有用。

verb · a polite way to say eat or drink

菜都齐了，请慢用。

verb · outlay or expense (often as a bound form)

他在穿和用上都很节省，每个月能存下不少钱。

verb, preposition · hence; therefore (literary)

兹事体大，用特向全体成员发函通知。