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buy的过去式是bought，过去分词是bought。作及物动词时意思是购买；买；获得；收买。作不及物动词时意思是买。作名词时意思是购买；便宜货。比如：I bought him a drink in return for his help。我请他喝酒以酬谢他的帮助。
buy的用法
一.buy用作动词
1.buy的基本意思是用金钱换取等价物,即“购买”,是普通用词,可接具体物品如书籍、衣物等作宾语。buy也可表示“付出…以换取…”,这时可接健康、幸福、名声、忠诚等抽象名词作宾语。buy引申还可指“收买,贿赂”“相信(即买…的账)”。
2.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。
Money can't buy happiness.
金钱买不来幸福。
I bought him a drink in return for his help.
我请他喝酒以酬谢他的帮助。
3.用作不及物动词 (vi.)
A lot of people just come into the shop without buying.
有很多人进店但却不购物。
二.buy用作名词
buy作名词时的意思有二:一是“买卖”,指用于商品交换间的交易; 二是“便宜货”,指价格上略低的货物。
It's a good buy at that price.
这是一笔价钱合算的买卖。
That shirt was a really great buy.