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Discover LudwigThe phrase "the big four" is grammatically correct and can be used in written English.
It is typically used as a noun phrase to refer to a group of four dominant or influential entities, often in a specific industry or context. Example: "The big four accounting firms are known for their global presence and prestigious client list." In this sentence, "the big four" refers to the four largest and most influential accounting firms in the world (Deloitte, PwC, EY, and KPMG).
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"In the next five to 10 years one of the Big Four could disappear.
The audit firm, one of the Big Four, did not name the partner.
The Big Four has become an Unbeatable One.
After the Big Four Railroad was built from Cleveland to Cincinnati, Baldwin built a railroad which would connect his quarries to the Big Four Depot.
The Big Four would object.
Stalin, Churchill, Roosevelt, Chiang — the Big Four.
How were the Big Four implicated?
The Big Four truly is no more.
But several factors keep the Big Four comfortable as incumbents.
Deloitte & Touche is now the smallest of the big four.
The committee hired PricewaterhouseCoopers, another member of the Big Four.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com