"amount of" 修饰的对象既可以是可数名词，也可以是 不可数名词，具体取决于句子的语境和所要表达的意义。以下是具体的用法示例：
修饰不可数名词
"A large amount of money was spent on the new project."
"There is a significant amount of research being conducted on climate change."
修饰可数名词
"Amounts of people attended the concert."
"Many amounts of effort were put into the project."
需要注意的是，当"amount of"后面接可数名词时，通常是将可数名词视为一个整体，即一个"总量"，因此谓语动词通常用单数形式。而当修饰不可数名词时，谓语动词的数则取决于"amount"的数，即"a large amount of"或"large amounts of"等结构中，谓语动词用单数，而"large amounts of"中，谓语动词用复数。
综上所述，"amount of"可以修饰可数名词，也可以修饰不可数名词，具体用法需要根据句子的语境和意义来判断。
