名 词 的 数可数名词通常有两种形式，即名词的单数和复数情况加法例词一般情况直接 + sPens, months , boys , books以s/x/ch/sh结尾的词直接 + esBoxes, chasses ,matches以“辅音+y” 结尾的词变y为i再加 esCities , countries以元音+o或+oo结尾的词直接 + sVideos ,radios , zoos , photos以f或fe结尾的词变f为v，再加 esLeaf-leaves, knife-knives常用不规则的复数形式：Man-men , woman-women , tooth-teeth , foot-feet , child-children , goose-geese 少数一些单词，复数和单数形式相同：Deer-deer , sheep-sheep , fish-fish , aircraft-aricraft1. That farmer has many ( ) on his fa
