many much的用法和区别

many修饰可数名词复数，much修饰不可数名词复数。
many作代词代表可数名词，much作代词代表不可数名词。
much还可以修饰动词，many不行。

例句：

Many items are at half price、

许多商品都以半价出售。

Many Quebeckers are federalists、

很多魁北克人是联邦主义者。

The war separated many families、

这场战争使许多家庭离散。

There isn't much mail today、

今天邮件不多。

Need you have paid so much?

你用得着花那么多钱吗？

How much thickener is used?

用了多少增稠剂？