many和much都有许多的意思，many修饰可数名词，much修饰不可数名词，二者具体区别及用法详见下文。
many和much的区别
1.many修饰可数名词。如：
I recall many discussions with her on these and kindred topics.
我回想起多次同她就这些问题及类似话题进行的讨论。
much修饰不可数名词。如：
He doesn’t spend much time preparing his lessons. 他备课不花太多时间。
2.many作代词代表可数名词，如：
Many of his ideas were amusing to her. 他的许多想法使她感到有趣。
much作代词代表不可数名词，如：
Much of the land was flooded. 大片土地被水淹没。
3.much可以修饰动词，many不可以。如：
I love you so much. 我非常爱你。
4.much可以修饰比较级，many不可以。如：
He is much taller than her.他比她高多了。
It's much more difficult than you thought.它比你所想的困难得多。