This exercise is easy to do.(改为复数形式)
This exercise is easy to do.(改为复数形式)
This is my friend 改为复数形式
This is an arm.改为复数形式
This is a box.改为复数形式
This is my sister.改为复数形式、
This is a pen.(改为复数形式)
Is this your friend?改为复数形式
This is my brother.改为复数形式
Is that this watch?改为复数形式
this is a book改为复数形式
This is my cousin.改为复数形式.
This is his cousin.改为复数形式