（1）a number of “许多；一些”；a great (large, good) number of “许多”，修饰复数可数名词，并且要与复数动词连用。
A number of books are missing from the library.
The number of books from the library is large. （the number of ＋复数名词←→单数动词）
(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）， 修饰不可数名词。
The room contained a great deal of furniture. （不可数名词）
The room contained a good deal of furniture. （不可数名词）
The room contained a large quantity of furniture. （不可数名词）
The room contained a large amount of furniture. （不可数名词）
The room contained a small quantity of furniture. （不可数名词）
The room contained a small amount of furniture. （不可数名词）
（3) 既可修饰可数名词,也可修饰
不可数名词的有:
a lot of
lots of
plenty of
a large quantity of
(4) enough的用法：
(A) 可接复数可数名词和不可数名词。
There are enough chairs. （可数）
There is enough furniture. （不可数）
(B) 可放在年修饰名词的前后。
We don't have enough time. =We don't have time enough.
（5）hundreds of, dozens of, thousands of, scores of ＋复数可数名词
冠词或数词(one, two...) ＋ (hundred, dozen, thousand, score) 复数可数名词
（6）(a) few用在复数可数名词之前，(a) little用在不可数名词之前。
（7）①many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.
②many 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.)
因篇幅问题不能全部显示，请点此查看更多更全内容