mang a修饰名词作主语谓语动词用单数还是复数

用单数.与every student 作主语同,因为形式上是单数名词作主语.类似的还有more than one student 作主语,也是单数谓语动词. eg.
Many a student has seen the film. 许多学生看过这部电影.
Many a fine man has died in that battle. 许多优秀的士兵死于那次战役.
但：a good many students作主语,则用复数了,eg.
A good many students come from Shanghai.
其实很好记,这叫形式一致.

复数
eg.many a student=many students,谓语动词用复数形式