特例：have*has 1.直接在词的末尾加s,reads,sits,stands2.以s,x,sh,ch结尾的在词尾加es,watches,brushes3.以o 结尾的加es ,go-goes ,do -does 4.以辅音字母加y结尾的,变y 为i 再加es ,fly -flies 5.以f,fe 结尾的将f...