Their father and mother 为什么?怎么时候算单三?

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Theirfatherandmother为什么?怎么时候算单三?Theirfatherandmother为什么?怎么时候算单三?Theirfatherandmother为什么?怎么时候算单三?Thei

Their father and mother 为什么?怎么时候算单三?
Their father and mother 为什么?怎么时候算单三?

Their father and mother 为什么?怎么时候算单三?
Their father and mother 是两个人,谓语动词用复数
Their father 或Their mother 是第三人称单数