exercise作名词时,当其表示“运动”时,它是个不可数名词,常用短语有：do/take exercise (相当于do/play sports); 当其表示“体操”、“练习”式,它是个可数名词,常用复数形式.如：do morning/eye exercise; finish the exercises on the blackboard.
morning exercise可数吗 那do morning exercise要加s吗
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