This is a fun way to revise grammar!
You get all your learners to stand up, get themselves into a nice long line, and then dictate to them sentences which are either right or wrong.
If they think the sentence is "right", they take a "big step" to the right (though as you can see in the photo, I got my learners just to look right or left); if they think it's wrong, they step or look left. You could make it an elimination game, Jo suggests, until you've got a "winner" — or make it boys vs girls.
You know the grammar casino game? You could play it like that, with the sentences you dictate being right or wrong grammatically.
It's fun — and might be especially good as a break for your hyperactive teens…