主要考虑司机的数量问题，如果是单数driver就用is，复数drivers就用are。与“他们的”无关。
他们的司机是懒惰的.
英语：
The driver for them is lazy.
Their drivers are lazy.
Their driver is busy.
Their driver is lazy.
Their drivers are lazy.都行，因为不清楚他们指的具体
They driver is lazy.
They drivers are lazy.
根据单复数决定
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