Is she your friend?写出下列句子的复数形式

Is she your friend?写出下列句子的复数形式 Is she your friend的复数形式 this is my book.写出下列句子的复数形式 写出下列单词的复数形式：this,is,brother,parent,sisier,friend,book,key 写出下列句子的复数形式 Is this your friend?改为复数形式 Is she your friend?(改为复数句) 把下列句子变成复数形式.It is your dictionary. 英语啊,求救~下面的句子都改成复数形式This is my uncleIs that his friend?Is she 写出下列句子相应的复数形式.this is an egg . Is she your mother?复数形式 写出girl friend的复数形式