动词的三单形式:+teach+watch+wash+do+push+go+buy+play+say+study+fl...答:动词第三人称单数形式的变化规则 一般在词尾加 s ,如 buy -buys play-plays say- says 以 s,x ch,sh,o结尾加 es,如 teach -teaches ,watch-watches, wash-washes,do-does,push-pushes,go-goes 以辅音字母加y结尾,把y改为i再加es,如 fly-flies,study-studies 不规则变化 have-has ...