they exercise every day to stay healthy问题为什么要用to stay 为什么要用动词不定式?

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• they exercise every day to stay healthy问题为什么要用to stay 为什么要用动词不定式?
• 动词ing 、动词不定式1.The best way to keep fit is to make exercise every day 中的to keep fit 是做定语吗?为什么要用不定式? 2.Taking so many exams made us tired 为什么要用动词ing形式,不是动词不定式作主语才表具体动作吗?
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• 英语题,要有解释. ---you should exercise exercise every day to stay ().A.unhealthy B.healthy C.health