teacher是名词，名词单复数变换，可数名词有单数和复数两种形式,不可数名词没有复数变化. ①．一般规则：A．直接加“s”； B．以“s”、“X”、“ch”、“sh”结尾加“es”； C．以辅音字母加“y”结尾，把“y”变“i”加“es”﹙roof→roofs除外﹚； D．以“o”结尾，有生命的加“es”，无生命的加“s” E．以f﹙e﹚结尾，把“f﹙e﹚”变为“ves” ②．特殊情况 A．单复数不一致：child---children man---men woman---women mouse---mice tooth---teeth foot---feet B．单复数一致：Chinese Chinese Japanese Japanese deer deer sheepsheep fish---fish C．只有复数形式：people trousers clothes glasses﹙眼镜﹚ The deer has four ______. A. foot B. feet C. feets D. foots Her two brothers are both ______. A. policeman B. policemans C. policemen D. policemens The _____ has two ______. A. boys, watches B. boy, watch C. boy, watches D. boys, watch There are lots of _____ in the basket on the table. A. tomatos B. tomato C. tomatoes D. tomatoss The cat caught two ______ last night. A. mouses B. mice C. mouse D. mices 本文来源：https://www.wddqw.com/doc/11551d2a01020740be1e650e52ea551810a6c9f3.html