英语中,名词变复数,什么时候加S ,什么时候加es? 怎么读答:规则例词 1一般情况在词尾加-smap-maps, sea-seas, girl-girls, day-days 2以s, x, ch, sh结尾的名词后加-esclass-classes, box-boxes, watch-watches, dish-dishes 3以-f或-fe结尾的词变-f和-fe为v再加-esleaf-leaves, thief-thieves, knife-knives, loaf-loaves, wife-wives 加-s...