Grammar Sandwich
There is
The teacher brings a plastic food container and suggests having a grammar snack.
When the container is opened, the students discover pieces of bread, slices of sausage, and cheese inside.
Their goal is to make correct sandwiches (bread + sausage + cheese). They should ultimately produce grammatically correct and logical sentences, e.g.: There are 7 days in a week.
The teacher monitors silently and feeds useful vocabulary if necessary.
When the time is up, check their answers in a teacher fronted way. 1 correct answer = 1 point. The pair with the most points wins.