a great + many + 名词的单数形式还是复数形式+ 动词用单数还是用复数?

问题描述:

a great + many + 名词的单数形式还是复数形式+ 动词用单数还是用复数?

many a + 单数名词,作主语时谓语动词用单数; a great/good many + 复数名词,作主语时,动词用复数