.My grandfather looks very young because he exercises every day.为什么用exercises

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.My grandfather looks very young because he exercises every day.为什么用exercises
.My grandfather looks very young because he exercises every day.为什么用exercises

.My grandfather looks very young because he exercises every day.为什么用exercises
我的外公看起来很年轻,因为他每天都锻炼身体.exercise在这里是动词,从everyday可看出是时态一般现在时,爷爷又是第三人称单数,exercise所以要加s

因为主语是he，所以用单三式exercises

exercise, v.: do physical exercise 锻炼，运动
所以exercise泛指一般运动
副词every day指定了动词时态为一般现在时
我的爷爷每天锻炼身体而显得很年轻

因为整句话是一个经常性的动作，经常性的动作就用第三人称单数形式。exercises是一般现在式。一般现在式就用第三人称单数形式，而exercise的第三人陈单数形式就是在词语的末尾加s，即为exercises。

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