求几个英语单词的复数形式

问题描述:

求几个英语单词的复数形式
ant-( ) tree-( ) leaf-( ) picture-( ) insect-( ) butterfly-( )
shelf-( ) clessmate-( )
好像大部分都是特殊的复数形式

ants
trees
leaves
pictures
insects
butterflies
shelves
classmates