buy在句中主要用作及物动词，偶尔用作不及物动词。用作及物动词时，后接名词或代词作宾语，有时还可接双宾语，其间接宾语可转化为介词for的宾语，可用于被动结构。buy的主语一般是人，也可以是无生命的事物。
1.买；购买
如：He bought a new coat for me.
他给我买了一件新外套。
2.（钱) 够支付
如：Five pounds doesn't buy much nowadays.
如今五英镑买不到多少东西了。
3.买通；收买；贿赂
如：He can't be bought.
他是收买不了的。
4.付出极大的代价而获得
如：Her fame was bought at the expense of her marriage.
她出了名，却牺牲了她的婚姻。
5.相信（尤指不大可能的事）
如：You could say you were ill but I don't think they'd buy it.
你可以称病，但我想他们不会相信的。
6.合算的商品
如：That jacket was a really good buy.
那件夹克确实买得很划算。
7.买进（或出售）的东西；购买
如：Computer games are a popular buy this Christmas.
这个圣诞节电脑游戏很畅销。
