Dogs like a lot of exercises.we often walk them in the park.it is important for everyone to doexercise every day .两个句子中的exercise意思都一样为什么前者是复数,后者是单数呢?
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do exercise 做体操/做运动, 是固定搭配, exercise 是不可数名词, 没有复数的.
exercise 作锻炼;练习讲时,是可数名词. 前面有a lot of ,故用复数.
再如: I do special neck and shoulder exercises...
我做专门的颈部和肩部运动.
You'd better get up early to do exercise.
你最好早点起床锻炼身体.
======以下答案可供参考======
供参考答案1:
exercise表运动时是可数名词，前面一个有a lot of 修饰，所以是复数，后面没有用单数