Question

“a good many”和“”a good many of”有什么区别？

Answer 1

a good deal of大量的,多的.后面跟不可数名词单数谓语 

a great many of大量的,很多.后面跟可数名词复数加复数谓语

a good many of大量的,很多的.后面跟可数名词复数加复数谓语 

例句：There are a great many books in the library.图书馆里有许多书.

A great dear of money was spent on the project.那项工程花费了大量金钱.

注意—— a great/good many of+代词（them,us,your...)/thr(these,those,your...)

a good many of+ 人称代词宾格复数a good many of the + 名词复数a good many + 名词复数前两个是特指，第三个是泛指。类似的用法有：most， many， some ，a number of，等。

Answer 2

a good many
两个词意思是“很多,许多,大量的”的意思
a good many of后加可数名词的复数或代词的宾格,指“…中的许多/很多东西”
请比较：
1、A good many students come from Shanghai.
2、A good many of students come from Shanghai.
第一句：很多学生来自上海.
第二句：学生中有许多来自上海.