名词单数变复数的规则一样举五个例子.求急答:f,fe--ves: leaf, thief,shelf, knife,life f,fe--s: belief, cliff, gulf, proof, fife o--s: piano, photo, memo, solo,soprano 不规则变化: tooth--teeth, foot--feet, goose--geese, ox--oxen, mouse--mice 单复数同行: cattle, means, deer,fish, bison ...