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Discover LudwigThe phrase "The key reason" is correct and commonly used in written English.
It is typically used when discussing the main or most important factor or cause for something. Example: "The key reason for the company's success is its strong brand recognition."
Exact(60)
The key reason is that they are only provisional.
The key reason for saving in the home is reliable access.
The key reason people come, though, is to experience the Kingdom of Women.
The key reason for this critical status is glacial retreat caused by global warming.
The key reason is that Seoul embarked on far-reaching market changes.
"The key reason is the president himself sees the need for a more balanced political system".
The key reason, they added, is that pharmaceutical firms want to rub elbows with others in the same business.
The key reason is that they were in power during the biggest economic crash of the past 80 years.
The key reason?
The key reason for this apparent transformation in Scots' voting behaviour lies in last year's referendum.
The key reason behind the efficiency of TQAM constellation is its compact geometry.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com