Many，much都意为许多，many+可数名词，much+不可数名词。
Many of the workers were at the meeting.
Much of the time was spent on learning.
a lot of 后面既可加可数名词亦可加不可数名词，谓语与后面的名词一致。
There are a lot of books.
There is a lot of food.
much修饰不可数名词
many修饰可数名词
a lot of即可修饰可数名词，也可以修饰不可数名词，一般用于肯定句中
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