Informal commands are used to address someone you refer to as tú. You begin with the tú form of the present tense. Remove the "s". (ie - hablas - ¡Habla!)
Formal commands are used when you address someone as usted.
Begin with the "yo" form of the verb.
For -ar verbs you replace the final -o of the yo form with an -e.
For -er and -ir verbs replace the final -o with an -a.
For Ustedes commands-
For -ar verbs you replace the final -o of the verb with an -en
For -er & -ir verbs you replace the final -o of the verb with an -an
***For irregular and stem-changing verbs - Remember that your verb keeps its irregular form or stem change in the command.
Spelling Changes of verbs ending in -car, -gar, -zar, -ger, and
Your sound must remain consistent -
tocar - toque/toquen
regar - riegue
almorzar - almuerce
recoger - recoja
seguir - siga