"many" 是一个 形容词，用于修饰 可数名词的复数形式，表示“许多”或“大量”的意思。例如：

I have many books.

There are many cars on the road.

She has many friends.

"many" 也可以用作代词，表示“许多人”或“许多事物”。例如：

Many people attended the concert.

Many things need to be done.

需要注意的是，"many" 不能修饰不可数名词，不可数名词应该用 "much" 来修饰。例如：

I drink much water.

She has much money.

总结：

"many" 修饰可数名词的复数形式。

"many" 用作代词时表示“许多人”或“许多事物”。

"many" 不能修饰不可数名词，应使用 "much"。