a large amount of 和 large amounts of的区别：
1、a large amount of +不可数名词，谓语动词用单数；large amounts of+ 不可数名词， 谓语动词用复数
例：A large amount of money was spent on the bridge.
在这座桥上花了大量资金。
例：Large amounts of money were spent on the bridge.
在这座桥上花了大量资金。
2、偶尔也可见到a large amount of +复数可数名词的用法，large amounts of不能加复数可数名词。
The shopkeeper had a large amount of oranges in his storeroom.