Helen,is that your classmate ruler?哪里错了

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Helen,is that your classmate ruler?哪里错了
Helen,is that your classmate ruler?哪里错了

Helen,is that your classmate ruler?哪里错了
Helen,is that your classmate’s ruler?

Ruler,如果不是大写的问题,好像没有错

classmate后面+'s,即classmate's.....表示某某人的