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Rule "comma before tag question"

This is one of many errors that LanguageTool can detect.

Description:	comma before tag question
Message:	A comma should precede the tag question (i.e., the yes/no-question at the end).
Category:	Punctuation (ID: PUNCTUATION)
Link:	https://www.thoughtco.com/tag-question-grammar-1692523
Incorrect sentences that this rule can detect:	She isn't coming is she? Correction suggestion: coming, He didn't know you did he? Correction suggestion: you, She was reading a book wasn't she? Correction suggestion: book, Ann and Tim will come won't they? Correction suggestion: come, She has already left hasn't she? Correction suggestion: left, You can drive can't you? Correction suggestion: drive,
Correct sentences for comparison:	Do you know how to do it? What floor is it? How would I do it? You really did it? Did she tell you why she did it? Can anybody do it? Are you sure Tom didn't do it? Do you know where Tom is or don't you? Why can't they do it? If you could do it, would you do it? Excuse me, how much is it? So this will do it? But should regular people do it? But does it?
ID:	COMMA_TAG_QUESTION [1]
Version:	6.8-SNAPSHOT (2026-05-04 22:33:08 +0200)

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