You should use "usted" commands when speaking to someone you don't know well or as a sign of respect. These commands use irregular verb forms similar to other conjugations like "dar" becoming "dé", "estar" becoming "esté", and "ser" becoming "sea". Examples show how to say "give it to me", "go to the store for me", and negative commands using this respectful verb form.

2. You will use usted commands when speaking to
someone you don't know or to show respect.
These need to be memorized - pretty much
they are the same verbs that are irregular for
other forms.
Dar Dé
Estar Esté
Haber Haya
Ir Vaya
Saber Sepa
Ser Sea

3. Ejemplos:
Give it to me - ¡Démelo!
Give them to me - ¡Démelos!
Go to the store for me - Vaya a la tienda para mí.
Be nice - Sea simpático.
Don’t give them to her. – No se los dé.
Don’t give them to me. – No me los dé.
Don’t go to the store for me – No vaya a la tienda para mí.
Don’t be nice – No sea simpático