comma before tag question

A tag question is a short confirming question added to the end of a statement (for example, "isn't he?", "don't they?"). Always put a comma before the tag to mark the end of the main clause and signal that the tag is a separate, confirming question.

Quick answer

Put a comma before a tag question: write "She's coming, isn't she?" not "She's coming isn't she?".

Place the comma immediately before the tag and one space after it.
Match the auxiliary verb and pronoun to the main clause (He is → isn't he?; They have → haven't they?).
Default polarity: positive clause → negative tag; negative clause → positive tag.

Core rule and compact grammar

Treat the tag as a separate, short question appended to a statement. The comma marks that separation.

Check three things: comma before the tag, correct auxiliary, matching pronoun and expected polarity.
If there's no auxiliary, use do/does/did in the tag: "He likes tea, doesn't he?"
Negative main clause → positive tag: "You don't want this, do you?"

Wrong: She's ready isn't she?
Right: She's ready, isn't she?

Common wrong/right pairs

Missing the comma is the most frequent error. These pairs show the correction and confirm auxiliary/pronoun agreement.

Wrong: You're coming to the meeting aren't you?
Right: You're coming to the meeting, aren't you?
Wrong: She can't drive can she?
Right: She can't drive, can she?
Wrong: We should leave now shouldn't we?
Right: We should leave now, shouldn't we?
Wrong: He studies French doesn't he?
Right: He studies French, doesn't he?
Wrong: This task is urgent isn't it?
Right: This task is urgent, isn't it?
Wrong: They won't mind will they?
Right: They won't mind, will they?

Real usage: work, school, and casual examples

Tag questions soften statements and confirm facts in different contexts. Punctuation still clarifies tone.

Work: We'll need the report by Friday, won't we?
Work: You forwarded the invoice to accounting, didn't you?
Work: This approach meets the client's requirements, doesn't it?
School: The study's sample size is sufficient, isn't it?
School: You referenced the primary source in paragraph three, didn't you?
School: This formula applies here, doesn't it?
Casual: You'll come to the party, won't you?
Casual: That movie was great, wasn't it?
Casual: You already tried the new café, haven't you?

Rewrite help: quick patterns and fixes

Fixes by pattern are fast: insert a comma, add/confirm auxiliary, then check pronoun and polarity.

Template: [Main clause], [auxiliary + pronoun]? - e.g., "She left, didn't she?"
If no auxiliary in the clause: add do/does/did in the tag: "He likes pizza, doesn't he?"
Polarity rule: negative main clause → positive tag; positive main clause → negative tag.

Rewrite: Faulty: "You're the manager aren't you?" → Corrected: "You're the manager, aren't you?"
Rewrite: Faulty: "I didn't see that page did I?" → Corrected: "I didn't see that page, did I?"
Rewrite: Faulty: "They can finish this by Monday can't they?" → Corrected: "They can finish this by Monday, can't they?"

Try your own sentence

Read the full sentence aloud. If the final words sound like a separate question, insert a comma before them.

Spacing and hyphenation details

Put the comma directly after the clause with no space before it and one space after it. Hyphenated phrases don't change the rule.

Correct spacing: word, tag? → one space after the comma. Wrong: "We agree ,don't we?"
Hyphenated example: "The long-term plan is solid, isn't it?" - the comma follows the clause normally.
Usage examples: The long-term project starts next week, doesn't it? / We agreed on the pre-meeting notes, didn't we?

Grammar edge cases

Tags work in most structures, but quotations, multiple clauses, or stacked tags can make the tag awkward. Restructure if needed.

If the main clause ends with a quote, often rephrase: "He said he's ready, hasn't he?" rather than tacking the tag inside the quoted material.
Avoid stacking tags: split long sentences into two instead of "It's late, isn't it, and we should go?" → "It's late, isn't it? We should go."
Use a dash sparingly for emphasis; prefer the comma for routine tag punctuation: "You did finish it, didn't you?"

Wrong: "'I'm done' isn't he?"
Right: "'He said he's done,' hasn't he?" or better: "He said he's done, hasn't he?"

Similar mistakes and quick fixes

Writers who drop the comma before tags often misplace commas with names (vocatives) or create comma splices. A short checklist catches these.

Checklist: spot the tag → insert a comma → check auxiliary/pronoun → confirm polarity.
Don't confuse tags with parenthetical phrases like "I hope"-both use commas but serve different roles.
Fix comma splices by splitting sentences or using connectors rather than tacking a tag onto a compound sentence.

Wrong: Let's go Sarah isn't it late?
Right: Let's go, Sarah - isn't it late?
Wrong: You're coming right isn't it?
Right: You're coming right, isn't it?

Memory trick to stop forgetting the comma

Use a two-step micro-routine: (1) read to the end of the main clause, (2) say the tag aloud as a separate question. The mental pause equals the comma.

Quick cue: "Pause - Tag." Pause = comma; Tag = the short confirming question.
Run a 1-second check: spot the tag, insert the comma, confirm auxiliary. Repeat until automatic.

FAQ

Do I always need a comma before a tag question?

Yes, in standard written English. In casual chat people sometimes skip punctuation, but for clarity and correctness include the comma.

What if the sentence ends in quotation marks?

Usually rephrase so the tag attaches to the clause, not awkwardly inside the quote: "He said he's ready, hasn't he?" If you attach the tag to the quote, follow normal quote-punctuation rules and aim for readability.

Is the tag always opposite in polarity to the main clause?

Generally yes: positive clause → negative tag; negative clause → positive tag. There are stylistic exceptions, but this is the default for clear communication.

Can I use a dash or semicolon instead of the comma?

Not for standard tag punctuation. A dash can add emphasis but is nonstandard; semicolons change sentence relationships and are inappropriate for tags.

How can I stop forgetting the comma before a tag?

Use the "Pause - Tag" trick, run the quick checklist (spot the tag → insert comma → check auxiliary/pronoun), and let a grammar checker flag omissions until the habit forms.

Want a second pair of eyes?

If you often miss small punctuation like this, run a quick grammar check to flag missing commas before tags and other repeated slips. One comma improves clarity-make it a habit.