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1、只能修飾可數(shù)名詞的：a large/ great/ good number of, a good/ great many, dozens of, scores of, quite a few。

2、只能修飾不可數(shù)名詞的：a great deal of, a large amount of, quite a little,a large sum of。

3、既可修飾可數(shù)也可修飾不可數(shù)名詞的：plenty of, a lot of, lots of, a large quantity of, a good supply of。

4、但是a number of不能修飾不可數(shù)名詞。