many much的区别：
1、many修饰可数名词复数，如：There are many people.有很多人。
much修饰不可数名词复数，如：I have much money.我有很多钱。
2、many作代词代表可数名词，如：
Many of these suggestions can only boost your confidence temporarily.
很多建议只可以暂时地提高你的自信。
much作代词代表不可数名词，如：
You didn't eat much of it.你过去没有吃太多.
3、much还可以修饰动词，many不行。
如：I love you so much.我如此爱你。
4、much还可以修饰比较级，many也不行。
如：He's much taller than her.他比她高多了。
It's much more difficult than you thought.它比你想的困难得多。