many a 修饰可数名词单数 谓语动词必须用复数
一、a number of , many , few ,a great/good many （of）修饰可数名词复数 谓语动词复数
二、a great deal of, a amount of=amounts of , much 不可数名词 谓语动词单数
三、即修饰可数又修饰不可数名词的有：plenty of, some, any , a lot of ,lots of , a mass of=masses of , a quantity of ,quantities of
其中如果a large quantity of加不可数名词,单数谓语
quantities of 加不可数名词,复数谓语