1、many修饰复数可数名词,表许多;much修饰不可数名词,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同义,但语气比较强,并且要与单数名词及单数形动词连用。
Many a prisoner has been set free. (=Many prisoners have been set free.)
3、as many和so many均等于the same number of。 前有as, like时, 只用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 fully expected as much. 〔同一事情)
5、many和much之后不接名词时,作为代名词;另外much也可用副词。
Many of them were very tired.
I don't eat much for lunch.
He is much taller than I.
6、many修饰可数名词复数,如:There aremany people.
much修饰不可数名词复数,如:I have much money.
7、many作代词代表可数名词,如:Many of the students have great results.
much作代词代表不可数名词,如:Much of the air is fresh.
8、much还可以修饰动词,many不行。
如:I love you so much.
9、much还可以修饰比较级,many也不行。
如:He's much taller than her.
It's much more difficult than you thought.