Negative informal commands:
Negative informal commands are form using the "yo" form of the verbs in the present tense (1), dropping the "o" (2) and adding (3)
-as if the verb ends in -er or -ir
-es if the verb ends in -ar
Remember that stem-changing verb rules are in effect here and that there are also special rules for yo - go verbs, and -car, -gar, -zar verbs,
Don't forget to add "no" before the negative informal command:
verbo positive commands negative informal command