Overview
Negative informal commands, also called negative tú commands, are used to tell a friend, family member the same age as you or younger, classmate, child, or pet not to do something.
No compres la camisa.
Do not buy the shirt.
No aprendas español.
Do not learn Spanish.
¡No escribasel ensayo!
Do not write the essay!
Always make sure you put no or another negative word like nunca (never) in front of the verb when forming a negative informal command.
Negative Informal Imperative Forms
The negative informal imperative, yet another term used to describe negative tú commands, is formed differently than the affirmative informal imperative. It is actually formed much like the negative formal imperative in that it uses the present subjunctive form of the verb.
If you already know the formal command forms, you can simply add an -s to the end of the formal command to form a negative informal command.
Infinitive Negative Formal Command Negative Informal Command
comprar
no compre
no compres
aprender
no aprenda
no aprendas
escribir
no escriba
no escribas
Irregular Negative Informal Commands
If a verb is irregular in the present subjunctive, its negative informal command form maintains the same irregularity.
No hagas la tarea.
Don't do the homework.
No seas injusto.
Don't be unfair.
Pronoun Placement
In negative informal commands, the pronoun goes between the negative wor(like no or nunca) and the verb.
Nunca les compres dulces a los niños.
Never buy candy for the children.
Nunca se los compres.
Never buy it for them.