This is a knife.（改为复数句） Is there a glass on theThis is a knife.（改为复数句）Is there a glass on the desk?(改为复数句)Ther are apples.（改为单数句）

This is a knife 改为复数 Is this your knife 改为复数句子 This is a box and that is a knife （改为复数句） This is a pen and that is a knife改为复数形式 This is a knife.怎样变复数. This is a knife.（改为复数句） Is there a glass on theThis is a knife.（改为复数句）Is there a glass on the desk?(改为复数句)Ther are apples.（改为单数句） This is a box and that is a knife.改为复数形式〔怎么变的〕 This is a book and that is a knife 改为复数句 Plrase put the clothes here 改为否定句麻烦全回答 This is an apple,that's a knife句型转换 This knife is sharp and that knife is blunt 翻译 This is a photo of my family (改为复数形式)为什么不改my family为our families?而This isn't my knife改为复数变为our knives? 把This is a box and that is a knife.改成复数形式 Whose knife is this?(改成复数) this is my knife改复数句 Is this her knife变复数 This knife is broken.(同义句) There is a knife in the kitchen.(改为复数形式)急! Do you have a knife改为陈述句