I teach kids from 7 upwards and have a small group of 3 kids who are 9 years old.I �m teaching them prepositions and get them to play with two boxes and some plastic fruit.
I pick one of them to give the commands such as: Put the orange in the box!
They love taking turns giving the commands and also playing against each other.
If I had a larger number of kids, I would get them doing the prepositions.
Such as saying: David is between Kristine and Anna.
I find that with simple prepositions, the kids start speaking faster too.
You can introduce any vocabulary you like and vary the games depending on how quickly they learn the prepositions.
My group are learning 8 prepositions at the moment and doing very well indeed.
Give it a try and hope your kids enjoy it!!
Hugs,
Fiona