Grammar Note
表示“大量”时，常用 a good deal of + 不可数名词，谓语动词用单数；表示“划算的买卖”时是可数名词，复数形式为 good deals。
大量；许多；很大程度
good deals — plural of good deal
先理解核心含义，再看它在真实句子里的用法。
大量；许多；很大程度
a large amount or extent
She spent a good deal of time researching before she wrote the report.
她花了很多时间研究，然后才写报告。
大量、众多或很大程度。
Large number, amount, or extent.
非比喻或习语用法；参见 good、deal。
Used other than figuratively or idiomatically: see good, deal.
He knows a good deal about ancient history, so ask him if you need help.
他对古代历史了解很多，所以你需要帮助可以问他。
There is a good deal of truth in what she said.
她说的话有很多道理。
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表示“大量”时，常用 a good deal of + 不可数名词，谓语动词用单数；表示“划算的买卖”时是可数名词，复数形式为 good deals。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.