只加可数的复数
a great many （of）
  a good/great many books
  a good/great many of my books
a  number of=many

2.+不可数名词
a great deal of
an amount of=amounts of
3.+不可数名词/可数的复数
a lot of
plenty of (前不加a)

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