a large amount of
大量的 都可接（但常接不可数名词）
a large amount of time大量的时间
give back a large amount of money退还大量钱款
drain a large amount of waste water排出一大堆废水
So as you said,we are not talking about a large amount of folks.
large amounts of 同上:大量的 都可接（但常接不可数名词）
large amounts of money大量的钱
Its always been a place to store large amounts of data and nothing more.
quantity of 数量；流量
Quantities /a large quantity of大量的
a quantity of 一些
a great quantity of大量
a small quantity of少量的
a large quantity of building materials大量的建筑材料
large quantities of＝a large quantity of大量的
都可接（但常见是接可数的)
If a quantity of oil should take fire ,how could it best be put off?
如果一些油着火了,最好怎样扑灭它?
' There isn't that large a quantity of it either—we mostly hear Rachmaninoff,Prokofiev and Shostakovich.
The IRA had decommissioned a quantity of weapons three times previously in 2001,2002 and 2003.