These are our books改成单数
These are our books改成单数
These are our books.(改成单数)
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
These are English books .(改为单数句
These are your books.(改为单数)
those are her books 改成单数
These are American cars 改成单数
are those our english books?改单数
these are our apples改为单数句子