commas with tag questions

A tag question is a question (like do you? or was it?) that is added at the end of a sentence. It consists of two basic elements:

• a verb
• a pronoun

Many tag questions also include the adverb not, usually attached to the verb in contracted form (n’t, as in don’t you? or wasn’t it?).

A tag question is set off from the rest of the sentence by a comma, as in the examples below.

• So I’m lucky, am I?
• Abshir isn’t here, is he?
• Your dog won’t bite me, will it?
• The chocolate frosting was delicious, wasn’t it?
• The meeting begins at 9:30, doesn’t it?
• Anne can join us, can’t she?