Imperative in English
Commands are also known as the imperative form. There is no difference if you give a command to a single person or to a goup of people - the form of the verb is the same. Put the verb in the infinitive form without "to" at the beginning of the sentence, you don't use a subject and end the sentence with an object.
Tell someone to do something
Put out the rubbish.
Take an umbrella with you.
Turn off the TV.
Negative form: to make commands negative, put "don't" or "do not" before the verb.
Tell someone not to do something
Don't shout at me.
Don't open the window.
Do not stay out too late.
Polite form: if you want to use the polite form, then add the word "please".
Please don't shout at me.
Please tell me your phone number.
Hand out the books, please.
Help me with the homework, please.