1)修饰可数名词复数形式的有 many, a good/great many, quite a few, a large (或great)/small number of等,其后的谓语动词用复数形式。
2)修饰不可数名词的有much, a great deal of, quite a little, an amount of等。其后的谓语动词用单数形式。
3)既能修饰可数名词,又能修饰不可数名词的有 a lot of, lots of, plenty of, a great quantity of等,谓语动词根据主语是可数或不可数决定单复数形式。
详情参照参考资料http://www.sqedu.com/gaokao/2008/0408/article_299.html