many a(n), a good / great many, a (great / large) number of, scores of, dozens of只可以修饰可数名词
另外一下这些也可以修饰可数名词也可修饰不可数
a lot of, lots of, plenty of (以上三个词语后谓语动词的数依of 后的名词的单复数而定),a great / large quantity of (其后谓语用单数),quantities of (其后谓语用复数)