1 exercise 作为‘ 练习’ 是可数名词,故要加S
作为‘ 锻炼’ 时,是不可数名词,如 take more exercise
2 most students 是复数,谓语动词（ 是实义动词一般现在时） 不变.,故不能加S
3 因为should 是情态动词,后接动词原形,故EAT 不能加S
加油!不明白再问!如果帮到你,请采纳,谢谢!
we do english exercises (为什吗加s） every day?
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