课本

‎在学校，老师推理一本课本。巧的是我妈有这本书。所以我打算带它去学校。不知为何，课本不见了。我妈以为是我不小心得丢了这本课本。但是今天她在找东西的时候，找到了这本书在她的文件里。
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At school, the teacher recommended a textbook. Coincidentally, my mom had that same book, so I planned to take it to school. For some reason, the book went missing. My mom thought I had accidentally lost it. But today, while she was looking for something, she found the book in her own files.