在英语语法中，定语从句是非常重要的一部分，能够帮助我们更准确地描述和表达所要表达的信息。在定语从句中，常常会遇到介词加关系词的情况，下面是一些例句，帮助大家更好地理解。
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The book on which I spent all my money is now a bestseller. (我用尽了所有的钱买下的那本书现在成为了畅销书。)
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The teacher to whom I owe my success will retire next year. (我成功的原因是因为那位老师，他将在明年退休。)
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The city in which he was born is a popular tourist destination. (他出生的城市是一个受欢迎的旅游目的地。)
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The company for which she works is well-known for its innovative products. (她工作的公司以其创新产品而闻名。)
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The restaurant at which we had dinner last night was very expensive. (我们昨晚吃饭的那家餐厅非常贵。)
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The person with whom I spoke on the phone was very helpful. (我在电话中和那个人交谈得非常愉快。)
以上这些例句中，介词加关系词起到了定语从句的作用，修饰了先行词。通过这些例句，我们可以更好地理解定语从句的应用，提高我们的英语表达能力。
