先看例句：
I have many questions. (question 可数)
You don’t have much time.(time 不可数)
I have a lot of questions.
You don’t have a lot of time.
总结：当描述可数名词时，使用 many. 例如： cars, trees, books 和 apples等.
当描述不可数的事物时,使用 much. 例如： money, time, space 和 air等.
a lot of 用于可数和不可数都可以。
例句：
I have many goats.I don’t need much money.I have a lot of parrots.I have a lot of time.
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