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Rule "Agreement: 'I is / you is / ... '"

This is one of many errors that LanguageTool can detect.

Description: Agreement: 'I is / you is / ... '
Message: Use third-person plural verb with 'they'.
Category: Grammar (ID: GRAMMAR)
Link: https://languagetool.org/insights/post/forms-of-to-be/#forms-of-the-verb-%E2%80%9Cto-be%E2%80%9D
Incorrect sentences
that this rule can detect:
  • They isn't too old for that.
    Correction suggestion: aren't, weren't
  • I feel they isn't ready to use.
    Correction suggestion: aren't, weren't
  • He thinks that they usually isn't lazy.
    Correction suggestion: aren't, weren't
Correct sentences
for comparison:
  • The world in which they live isn't constantly changing.
ID: PERS_PRONOUN_AGREEMENT [14]
Version: 6.8-SNAPSHOT (2025-10-24 22:33:07 +0200)