a good deal ,a great deal ,a good many,a great many 都有大量许多的意

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...)