Phrase
a great deal
adverb
很多；非常；大量
Very much; to a great extent; a lot; lots.
- 1.
Very much; to a great extent; a lot; lots.
非常；在很大程度上；很多；大量。
非常；在很大程度上；很多；大量。；大量
In use
She has learned a great deal from her travels.
He spends a great deal of time reading.
The project requires a great deal of money.
a great deal of + [uncountable noun]
后接不可数名词，表示数量多。
She has a great deal of experience in marketing.
她在市场营销方面有大量经验。
verb + a great deal + (about/of sth)
修饰动词，表示程度深。
He knows a great deal about ancient history.
他对古代历史了解很多。
a great deal + comparative adjective/adverb
用于修饰比较级，强调程度大。
This method is a great deal more efficient.
这种方法高效得多。
Common mistakes
He has a great deal books.He has a great deal of books.
a great deal 后面必须接 of 才能修饰名词，表示“大量的”；直接接名词是缺少介词的错误。
She bought a great deal of apples.She bought a lot of apples.
a great deal of 只能修饰不可数名词，apples 是可数名词，应用 a lot of 或 a great many。
Connections
Confusing words
- a lot
- 许多 · 语义相似，但'a lot'更口语化，且可修饰可数或不可数名词；'a great deal'多修饰不可数名词。
- many
- 许多 · 语法差异：'many'只修饰可数名词复数，而'a great deal of'修饰不可数名词。
- a good deal
- 大量 · 语义相同，但'a good deal'语气略正式，且常与不可数名词搭配，与'a great deal'可互换，但后者更强调程度。
Learner notes
Grammar Note
仅作程度副词，不充当主语或宾语，也不直接后接名词；表示数量需改用其他结构。
Dictionary facts from ECDICT, WIKTIONARY.