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

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.Mygrandfatherlooksveryyoungbecauseheexerciseseveryday.为什么用exercises.Mygrandfatherlooksveryyoungbeca

.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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