Those are our tickets.的单数形式怎么写?

Those are our tickets.的单数形式怎么写? Those are our teachers怎么改为单数形式急! teeth these those their的单数形式怎么写? Those are blue pens的单数形式 those are cakes单数形式 Are those oranges?单数形式 those的单数形式 Those are your books.改为单数形式要怎么改? 怎么把Are those your keys改为单数形式? those are green jeeps.改成单数形式 they are our good friends are t Those are our hats.改为单数 are those our english books?改单数