many的比較級是more；最高級是most。many可用作形容詞，表示許多的，用作形容詞時(shí)后接復(fù)數(shù)名詞,表示許多同樣的人或物(但數(shù)目不明確)。用作名詞時(shí)，表示許多，許多人。用作代詞時(shí)表示許多的人或物。

many和much的用法

(1)many修飾復(fù)數(shù)可數(shù)名詞，表許多; much修飾不可數(shù)名詞，表量或程度。

He has many friends, but few true ones.

There hasn’t been much good weather recently.

(2)many a: many a和many同義，但語氣比較強(qiáng)，并且要與單數(shù)名詞及單數(shù)形動(dòng)詞連用。

Many a prisoner1 has been set free. (=Many prisoners2 have been set free.)

(3)as many和so many均等同于the same number of。 前有as, like時(shí), 只能用so many。

These are not all the books I have. These are as many more upstairs.

They worked like so many ants.

(4)as much等同于the same amount of，表同量和同一事情。

He bought two pounds of sugar and as much tea. 〔同量)

I was not in the least surprised, for I had fully3 expected as much. 〔同一事情)

(5)many和much之后不接名詞時(shí)，作為代名詞;另外much也可用副詞。

Many of them were very tired.

I don’t eat much for lunch. 〔代名詞)

He is much taller than I. (副詞〕

擴(kuò)展：表示“許多”的詞組的對比分析

(1) plenty of, a lot of, lots of均表“許多”，修飾復(fù)數(shù)可數(shù)名詞或不可數(shù)名詞。

The room contained plenty of (or a lot of or lots of) students.(復(fù)數(shù)名詞)

The room contained plenty of (or a lot of or lots of) furniture.(不可數(shù)名詞)

(2) a great (or a good) deal of, a large (or a small) quantity of, a large (or a small) amount of, 均表(量)， 修飾不可數(shù)名詞。

The room contained a great deal of furniture. (不可數(shù)名詞)

The room contained a good deal of furniture. (不可數(shù)名詞)

The room contained a large quantity of furniture. (不可數(shù)名詞)

The room contained a large amount of furniture. (不可數(shù)名詞)

The room contained a small quantity of furniture. (不可數(shù)名詞)

The room contained a small amount of furniture. (不可數(shù)名詞)

(3) a number of “許多;一些”;a great (large, good) number of “許多”，修飾復(fù)數(shù)可數(shù)名詞，并且要與復(fù)數(shù)動(dòng)詞連用。

A number of books are missing1 from the library.

The number of books from the library is large.

The room contained a great (or large or good) number of students.(復(fù)數(shù)可數(shù)名詞)