Tag questions or question tag are the short questions that we put on the end of sentences – particularly in spoken English. These are formulated in order to confirm information or seek for agreement.
If the main part of the sentence is positive, the question tag is negative. Examples:
If the main part of the sentence is negative, the question tag is positive. Example:
The question tag uses the same verb as the main part of the sentence. If this is an auxiliary verb (‘have’, ‘be’) then the question tag is made with the auxiliary verb. Example:
If the main part of the sentence doesn’t have an auxiliary verb, the question tag uses an appropriate form of ‘do’.
If there is a modal verb in the main part of the sentence the question tag uses the same modal verb.
Note: it is really important to remember this exception. With sentences that start ‘I am’, the tag question is ‘aren’t I?’ This rule only applies when the first part of the sentence is affirmative. Example: