The boy doesnt become sleepy改为肯定句为什么became后要加s答:[注]:少数以o结尾的词,变复数时只加s。如:photo→photos, piano→pianos.③以辅音字母加y结尾的名词,变y为i,再加es。如:family→families, city→cities, party→parties.④以f或fe结尾的名词,变f或fe为v,再加es。如:shelf→shelves, wolf→wolves, life→lives, knife→knives.2、不规则...