还用 háiyòng is it necessary Origin Definitions Defs Strokes Stroke Words Sentences Sents 还 還 hái adverb is it necessary used in the pattern 还用 háiyòng to indicate that something goes without saying or is obvious用 yòng verbauxiliary to need To need or have to; this use is frequently found in questions or negative statements such as 不用 bùyòng.