This is a pen.(改为复数形式)
This is a pen.(改为复数形式)
this is a pen.改为复数句
This is a pen and that is a knife改为复数形式
This is a box.改为复数形式
this is a book改为复数形式
This is a cat.(改为复数形式)
What is that?itis a pen改为复数形式
that is a pen (改为复数形式)
It is my pen.(改为复数形式)
This is his pen.复数形式
This is my pen复数形式
英语复数形式it this a book,it is a pen,there is a book,以上改成复数形式.th