名词的数 （ 分可数名词和不可数名词） 可数名词[c]n.:
1.可数名词有单数和复数之分，单数可是_________来修饰，复数可用______________ ______________________________________及数词等修饰。
2.以o结尾加es的词: _________________________________________________________
3.以f或fe结尾的变f为v再加es。如：knife-knives, wife-wives, half-halves, shelf-shelves, leaf-leaves, yourself-yourselves
4.单复数同形有：____________________________________________________________
5.复数名词的有：____________________________________________________________
6．特殊变的有： man-________, child-________, foot-________, mouse-________
不可数名词[u]n.:(1).它不能用_________________修饰，也没有_____________形式，(2).他们可以用_______________________________________________________等修饰。
3.常见的[u]n.有_____________________________________________________________ ___________________________________________________________________________
