1、many、a great/good many 、a great/large number of 、scores of、dozens of和 (quite) a few, 這類“許多”修飾作主語的名詞時，只能修飾名詞複數形式，謂語動詞用複數。
There are a great/good many English books in our school library.
2、the number of + n （可數名詞複數） 表示"....的數目”,用它做主語時，謂語用單數
The number of the students in our class is 55.
3、既可以修飾可數名詞複數， 又可以修飾不可數名詞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、只能修飾不可數名詞的“許多” 有：much、a great / good deal of 和a large amount of ，這類“許多”修飾主語名詞時候， 謂語用單數。
I don"t know they gave us much help.
5、a great deal 做名詞片語和副詞片語，也表示“大量，許多”，還可以修飾比較級，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 + 單數可數名詞也表示許多，這個短語作主語時謂語用單數。
Many a girl in our class has learned to swim.
1、many、a great/good many 、a great/large number of 、scores of、dozens of和 (quite) a few, 這類“許多”修飾作主語的名詞時，只能修飾名詞複數形式，謂語動詞用複數。
There are a great/good many English books in our school library.
2、the number of + n （可數名詞複數） 表示"....的數目”,用它做主語時，謂語用單數
The number of the students in our class is 55.
3、既可以修飾可數名詞複數， 又可以修飾不可數名詞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、只能修飾不可數名詞的“許多” 有：much、a great / good deal of 和a large amount of ，這類“許多”修飾主語名詞時候， 謂語用單數。
I don"t know they gave us much help.
5、a great deal 做名詞片語和副詞片語，也表示“大量，許多”，還可以修飾比較級，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 + 單數可數名詞也表示許多，這個短語作主語時謂語用單數。
Many a girl in our class has learned to swim.