many much的區別：
1、many修飾可數名詞復數，如：There are many people.有很多人。
much修飾不可數名詞復數，如：I have much money.我有很多錢。
2、many作代詞代表可數名詞，如：
Many of these suggestions can only boost your confidence temporarily.
很多建議只可以暫時地提高你的自信。
much作代詞代表不可數名詞，如：
You didn't eat much of it.你過去沒有吃太多.
3、much還可以修飾動詞，many不行。
如：I love you so much.我如此愛你。
4、much還可以修飾比較級，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.它比你想的困難得多。