Wait quietly before class.
Be nice to your brother or sister.
Don’t forget your bag!
You can use ‘please’ to be more polite.
Please put the plates on the table.
Don’t make so much noise please.
Don’t say ‘you’ and use the verb without ‘to’ and without ‘ing’.
Help your parents at home.
Don’t run in the corridors.
We say... We don’t say...
Help your parents at home. (NOT You help your parents at home.)
Don’t run in the corridors. (NOT Don’t to running in the corridors.)