Question

buy的三单是

Answer 1

①在一般现在时中,当主语为第三人称单数时,动词要用“s”型（即第三人称单数形式）.

②所谓动词“s”型的构成,可按名词变复数的规则来记,即：

(1)在动词尾直接加 s.如：

play—plays,want—wants,work—works,know—knows,help—helps,get—gets

(2)以字母s、x、ch或o结尾的动词加-es；如：

guess—guesses,fix—fixes,teach—teaches,brush—brushes,go—goes,do—does,watch—watches,catch—catches

(3)以辅音字母＋y结尾的动词,先变y为i,再加-es.如：

study—studies,carry—carries,fly—flies,worry—worries

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