Verifying Tags is an activity to practice using question tags.
Question Tags are often used to verify information of which we are not 100% certain. For example we might be discussing holidays and ask someone, "You went to the Seychelles a few years back, didn't you?"
This activity puts this kind of question tag in a more realistic situation.
In class, work with your students to prepare a list of some 10 or so questions to be asked to each other which you can write up on the board:
And so on. Try and mix and match tenses.
Now divide the class into two similarly sized teams (e.g. boys vs girls, management vs workers, light hair vs dark hair, etc). Get one team in a circle facing out and the other team in a circle around them facing in. They then pair up and ask and answer the questions with a member of other team. After 60 seconds have them change partners and ask/answer with another member of the other team. Do this for 10 minutes or so.
The next step is to bring the class back together and present question tags in context. You can go over the grammar and work with the students in getting them to understand how question tags are formed and used, not forgetting the intonation!
By now, most of the students will have forgotten the answers they received to the questions you wrote on the board at the beginning of the lesson.
Divide the class into two teams and in turn get a member of one team to make a statment to a member of the other team based on the questions on the board.
If they make a plain statement which is correct, they get 1 point for their team:
If they don't know, they can make a statement with a correct question tag:
If the question tag is good, but the facts are wrong they get 1 point. If the question tag is good and the facts are true, they get 2 points.
Thus, they're encouraged to use question tags and get more points!