一、名词的复数。名词按其数,可分两种:可数名词和不可数名词.可数名词的复数变化规则:1.一般情况下,直接在词尾加s,如:girlgirls,bookbooks,penpens2.以s,,sh,ch结尾的词,在词后加es,如:classclasses,boboes,matchmatches,3.以辅音字母+y结尾的,变y为i再加es,如:citycities,familyfamilies,countrycountries4.以f或fe结尾的,变f或fe为v再加es,如:knifeknives,wifewives,lifelives,5.以o结尾的加es或s,如:radioradios,tomatotomatoes,potatopotatoes,zoozoos,photophotos,6.manmen,womanwomen,footfeet,childchildren,二、时态小结时态定义特征...