owe one's a favor 欠一个人情I owe my sister a favor because she lent me money when I couldn't pay my rent.
我欠我姐姐一个人情,因为在我付不起房租的时候她借钱给了我.
Just because he gave me a ride home, he thinks I owe him a favor in return.
就因为他让我搭他车回家,他就认为我该还他的人情.
来自:和谐
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