exercise作动词：（锻炼） 单三都懂啦.主语是第三人称单数的时候它是谓语动词变单三加s 例：He exercises every day exercise作名词： （练习题）作这个意思的时候是可数名词 例：He does a lot of exercises to improve his English. （锻炼；运动）作这个意思的时候是不可数名词 例：He takes exercise every day. 例外：作（体操）时可以加's' 像 morning exercises ,do exercises(=do sports做运动,例外中的例外) ,eye exercises
