写出下列词的复数形式：is,this,it,that,woman,german,frenchman,knife,leaf,child,family,fly,ruler,tooth,wolf,he,american,people,sheep
问题描述：
写出下列词的复数形式：
is,this,it,that,woman,german,frenchman,knife,leaf,child,family,fly,ruler,tooth,wolf,he,american,people,sheep
答
are these those women germans frenchmen knives leaves children families flies rulers teeth wolves they americans people sheep