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Discover LudwigSuggestions(5)
'is the main reason' is correct and can be used in written English.
Whenever you want to explain why something is the case, you can use this phrase to emphasize what the main factor contributing to the situation is. For example, "The high cost of tuition is the main reason why many students struggle to pay for college."
Exact(60)
Demography is the main reason.
Terrible driving is the main reason.
Starting pitching is the main reason.
Andrew Luck is the main reason.
Overwatering is the main reason succulents die.
Lack of investment is the main reason.
It is the main reason why calculus is so effective.
Lipitor is the main reason Pfizer refuses to walk away.
Such technology is the main reason production has remained viable.
"This is the main reason they intervened," he said.
That is the main reason that Hillary is suddenly everywhere.
More suggestions(15)
is the foremost reason
is the basic reason
is the predominant reason
is the main motive
believes the main reason
is the primary reason
is the overriding reason
is the main justification
is the core reason
information the main reason
benefits the main reason
is the main component
is the main consideration
is the main risk
is the main source
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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