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Rule "mismatched verbs and tag question operators"

This is one of many errors that LanguageTool can detect.

Description: mismatched verbs and tag question operators
By default, this rule is not active in LanguageTool
Message: In a tag question, the operator (verb) must match the verb ‘is’.
Category: Punctuation (ID: PUNCTUATION)
Incorrect sentences
that this rule can detect:
  • He's crazy, doesn't he?
    Correction suggestion: isn't he
  • He is crazy, doesn't he?
    Correction suggestion: isn't he
Correct sentences
for comparison:
  • Tom's being here means a lot to you, doesn't it?
ID: TAG_QUESTIONS_2 [14]
Version: 6.7-SNAPSHOT (2025-04-23 22:33:11 +0200)