Similar to UonumaRobert's simple Janken Commands,
I made this worksheet to practice giving commands in Imperative form.
Put students into pairs, and give out this worksheet.
Have students play Rock, Paper, Scissors and the winner gets to give a command their partner.
The partner then must do the action.
The winner puts a check or their initials in the box, and they start over with Rock, Paper, Scissors.
This can be repeated with the same partner or with different partners and the worksheet had columns for up to 3 rounds.
If students are unfamiliar with the actions, you can practice the actions with the students before they start,
and also you can demo the gameplay with the JTE before letting them start to be sure they know what to do.
This activity aligns with New Treasure Book 1, Lesson 6-1 for JHS 1st year students, but probably could be used for upper elementary as well.
There are two versions, each has a different set of actions.