many much a lot of用法区别和例句如下：

1.MUCH

much修饰不可数名词，常用于疑问句和否定句。

Is there much water in your glass?

你的杯子里有很多水吗?

There isn't much milk in the bottle.

瓶子里没有多少牛奶了。

Is there much snow on the mountains?

山上有很多雪吗?

There isn't much water in your cup.

你的杯子里没有多少水了。

2.MANY

much修饰可数名词复数，常用于疑问句和否定句。

Are there many horses in the field?

田野里有许多马吗?

There aren't many tomatoes in the bowl.

碗里没有多少西红柿了。

There aren't many apples in the fridge.

冰箱里的苹果不多了。

Have you got many friends in Roma?

你在罗马有很多朋友吗?

3.A LOT OF

 a lot of修饰可数名词复数和不可数名词，常用于肯定句。

There are a lot of eggs in the fridge.

冰箱里有很多鸡蛋。

There is a lot of milk in the pitcher.

水壶里有很多牛奶。

There is a lot of sand in my pockets.

我的口袋里有很多沙子。

There are a lot of writers but there aren't many readers.

有很多作家，但没有很多读者。

注意：我们也用lots of来代替a lot of，尤其是在口语中，它们的意思没有区别。