1. 修饰可数名词的常用修饰语有these, those, few, a few, many, a good [great] many, a great [good] number of 等：

these students 这些学生                    a few friends 几个朋友

a great many letters 许多信件    many factories 许多工厂

【注】a good [great] many 后直接跟名词，没有介词 of。

2. 修饰不可数名词的常用修饰语有this, that, little, a little, a bit of, much, a great deal of 等：

this paper 这种纸                              much money 许多钱

a little milk 一点点牛奶                      a great deal of time 许多时间

3. 有些修饰语既可修饰可数名词也可修饰不可数名词，如all, some, enough, a lot of, lots of, plenty of 等：

some books 一些书                           some time 一些时间

a lot of workers 许多工人    a lot of water 许多水