sit well or sit properly.

[explorelang]

How do you tell a child when you want to say him sit well while eating or studying?

[Casiopea]

I use, "Sit properly, please" and "Sit up straight, please", or the commands, "Sit properly", Sit up", and "Sit straight."

[explorelang]

Thanks Casiopea.

[Casiopea]

You're welcome.