法院庭长有哪些实权: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？

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？ a great many, a great deal, a great amount of, a large part of的区别 a good many 等于a great many 是否相同? a great many为什么有个a呢？ A great many of什么意思？？有这个词组吗？ a good many, a plenty of, a varienty of,a great deal之间有什么区别? A great many former pupils will be attending a farewell dinnerin his honour next Thursday. There is a great store with many heroes. 如何翻译?with怎么讲? 不懂这一句“in one part of the town a great many buildings were destroyed." many 是用在不可数名词上的吗