Many a就是many的意思.但是Many a后面接单数名词,所以需要用动词的单数形式.这种写法很少见,一般说many students and teachers have gone to the meeting already如果是many a students就用复数？不能说many a students.many a student =many students，属固定用法。一般人不用，专用来耍cool或者考学生