A question tag is a short question at the end of a sentence, which we use to find out information or check information that we already have. This is how you form question tags:
Positive sentence - negative tag
You will do it quickly, won't you?
Negative sentence - positive tag
She isn't happy, is she?
Main verb - use 'do'
We went to the party, didn't we?
Yuki and Tomo are Japanese, aren't they?
Question tags are often used in spoken English. A rising intonation is used to show that the question is real, whereas a falling intonation shows that the speaker just wants confirmation from the person being spoken to.
Question Tags are formed in this way:
It is raining, isn't it?This is a negative tag (The tag is the part after the comma, ‘isn’t it’ )
It is not raining, is it?This is a positive tag.
The most important thing to remember is that the auxiliary verb in the statement 'It is raining,..' must be changed to it's opposite form for the tag 'isnt, it?'
Here are a few examples of the opposite forms of auxillary verbs: