sell，before，night, summer ,go ,in ,good ,ask的反义词分别是？

sell-buy，before-after，night-day,
summer-winter ,go-come ,in-out ,
good-bad ,ask-answer

buy,after,day,winter,come,out,bad,answer

里面有一些是对应词而不是反义词。

buy,after,day,winter,come,out,bad,answer

buy , after, day, winter, come，out,bad,answer