"A great deal of"用於修飾不可數名詞，表示「大量的」、「許多的」。例如：
A great deal of money has been invested in this project。
A great deal of water is needed for this task。
A great deal of time has been spent on this project。
這些句子都正確地使用了"a great deal of"，後面接了不可數名詞，並且謂語動詞使用了單數形式。