buy的复数形式是buys,同时buy大多数情况下均为动词,所以那时只有三单,buys

buy英音:[bai]美音:[baɪ] 现在分词:buying 过去式:bought 过去分词:bought

注:buy是以元音字母加y结尾的,直接加S为buys,buy的三单就是buys