Whose pens are these?

这些是谁的钢笔？

同一单元的其他句子

• Is this your pencil?这是你的铅笔吗？
• That is my eraser.那是我的橡皮擦。
• These are her books.这些是她的书。
• Those are his rulers.那些是他的尺子。
• Whose notebook is this?这是谁的笔记本？