Are there math books?改为单数形式是什么?
Are there math books?改为单数形式是什么?
There are English books.(改为单数形式)
they are English books.(改为单数形式)
these are new books.改为单数形式
these are chinese books 改为单数形式
These are English books.改为单数形式
are these your books?改为单数形式
There are some photos,改为单数形式
These are my English books.改为单数形式
They are English books (5改为单数形式)
Those are your books.改为单数形式要怎么改?
These books are new 怎么改为单数形式急!