a large amount of 和 large amounts of的區別：
1、a large amount of +不可數名詞，謂語動詞用單數；large amounts of+ 不可數名詞， 謂語動詞用復數
例：A large amount of money was spent on the bridge.
在這座橋上花了大量資金。
例：Large amounts of money were spent on the bridge.
在這座橋上花了大量資金。
2、偶爾也可見到a large amount of +復數可數名詞的用法，large amounts of不能加復數可數名詞。
The shopkeeper had a large amount of oranges in his storeroom.