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Rule "'the reason... is because'"

This is one of many errors that LanguageTool can detect.

Description: 'the reason... is because'
Message: The word "because" means "for the reason that" and thus introduces redundancy.
Category: Style (ID: STYLE)
Link: https://onlinewritingtraining.com.au/the-reason-is-that-or-the-reason-is-because/
Incorrect sentences
that this rule can detect:
  • The reason that Tom isn't here is because he's sick.
    Correction suggestion: is that
Correct sentences
for comparison:
  • The root reason of his failure is because of his arrogance.
ID: REASON_IS_BECAUSE [2]
Version: 6.8-SNAPSHOT (2025-10-26 22:33:08 +0100)