This is a pen and that is a knife改为复数形式
This is a pen and that is a knife改为复数形式
This is a box and that is a knife.改为复数形式〔怎么变的〕
This is a pen.(改为复数形式)
把This is a box and that is a knife.改成复数形式
This is a box and that is a knife (改为复数句)
This is a book and that is a knife 改为复数句 Plrase put the clot
This is a knife 改为复数
What is that?itis a pen改为复数形式
that is a pen (改为复数形式)
this is a pen.改为复数句
There is a knife in the kitchen.(改为复数形式)
that is a biack knife的复数形式是什么