1、many、a great/good many 、a great/large number of 、scores of、dozens of和 (quite) a few, 这类“许多”修饰作主语的名词时,只能修饰名词复数形式,谓语动词用复数。
There are a great/good many English books in our school library.
2、the number of + n (可数名词复数) 表示"....的数目”,用它做主语时,谓语用单数
The number of the students in our class is 55.
3、既可以修饰可数名词复数, 又可以修饰不可数名词a lot of 、lots of 、plenty of 、supplies of ,a great/quantity of 、great/large quantities of。
He has got a lot/lots of questions to ask.
4、只能修饰不可数名词的“许多” 有:much、a great / good deal of 和a large amount of ,这类“许多”修饰主语名词时候, 谓语用单数。
I don't know they gave us much help.
5、a great deal 做名词词组和副词词组,也表示“大量,许多”,还可以修饰比较级,表示程度。
At the end of the year there was a great deal to do.年底有很多事情做。
6、many a /an + 单数可数名词也表示许多,这个短语作主语时谓语用单数。
Many a girl in our class has learned to swim.