Forming the imperative for usted/ustedes/nosotros/nosotras (affirmative and negative commands)

In Spanish, the nosotros/nosotras/usted/ustedes forms of El Imperativo, both in affirmative and negative commands take same form as El Presente de Subjuntivo.

Here is a reminder of regular verbs conjugations in El Presente de Subjuntivo:

Conjugate regular -ar verbs in the present subjunctive in Spanish (El Presente de Subjuntivo)

Conjugate regular -er and -ir verbs in the present subjunctive in Spanish (El Presente de Subjuntivo)

Bear in mind that there are lots of verbs with stem-change and consonant change in the present subjunctive, though.

Let's look at nosotros/nosotras first, then usted/ustedes.

Spanish imperative of Nosotros/Nosotras (we)

To say Let's [do something] or Let's not [do something]  in Spanish as a form of command to ourselves we use the verb in the present subjunctive form for nosotros/nosotras (first person plural). 

Have a look at these examples:

Ella no quiere que nosotros comamos tan rápido. (present subjunctive)
She doesn't want us to eat so fast.

¡Comamos más rápido! (affirmative command)Let's eat faster!

¡No comamos tan rápido! (negative command)Let's not eat so fast!

Notice how they all coincide in their form. 

Alternative structures not using the imperative

Bear in mind though, that in a more colloquial way, we would probably use an interrogative sentence introduced by "¿Por qué no...?" followed by El Presente with the same purpose, an affirmative command to "ourselves". For example:

¿Por qué no vamos a la playa?
Why don't we go to the beach?/Let's go to the beach!

And in the negative cases, we would probably prefer to use a different sentence structure introduced by "Mejor no..." followed by El Presente. For example:

Mejor no vamos a la playa. 
Let's not go to the beach!

Both "¿Por qué no...?" and "Mejor no..." followed by El Presente are more frequently used in speech than their equivalent forms using the imperative:

Vayamos a la playa.
Let's go to the beach! (affirmative command)

No vayamos a la playa.
Let's not go to the beach! (negative command)

Here are other examples using the imperative:

¡Hagamos una fiesta!Let's organise a party!

¡Limpiemos el coche!Let's clean the car!

¡Tengamos paciencia!Let's be patient!

¡No seamos egoístas!Let's not be selfish!

Spanish imperative of Usted and Ustedes (you formal singular and plural)

To express an affirmative or negative command directed to "you" (formal) we also use the usted/ustedes form (3rd person singular/plural) in El Presente de Subjuntivo. A typical situation is in a formal conversation or transaction, for example in a bank.

Here are some examples:

Necesito que firme aquí, Señor. (present subjunctive)
I need you to sign here, Sir.

Señor, firme aquí, por favor. (affirmative command)Sir, sign here, please.

Señor, no firme aquí. (negative command)Sir, do not sign here.

Señoritas, no es bueno que beban mucho champán. (present subjunctive)
Ladies, it is not good to drink lots of champagne.

Señoritas, beban un poco de champán. (affirmative command)Ladies, drink a little champagne.

Señoritas, ¡no beban tanto champán! (negative command)Ladies, don't drink so much champaigne!

Notice how they all coincide in their form. 

Another typical context for this is road signs:

Conduzca despacio. (affirmative command, usted)Drive slowly.

Disminuya la velocidad. (affirmative command, usted)Reduce speed.

No tiren papeles al suelo. (negative command, ustedes)Don't throw papers on the floor.

Here are more examples (usted):

¡Tenga el cambio!Here's your change! 

Señor, ¡no corra!Sir, don't run

¡Diga la verdad!Tell the truth! 

Here are more examples (ustedes):

¡Salgan a tiempo!Leave on time!

Señor y Señora Valls, ¡compren una nueva lavadora!Mr. and Mrs. Valls, buy a new washing machine!

¡No digan mentiras!Don't tell lies! 

No hablen tan rápido, por favor.Don't speak so fast, please.

Remember that many verbs undergo stem changes and consonant changes when they are conjugated in  El Presente de Subjuntivo and these need to be kept when making a command.

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Examples and resources

Señor Perez, ¡compre un ordenador cuanto antes!Mr. Perez, buy a computer as soon as possible!
¡No seamos egoístas!Let's not be selfish!
No tiren papeles al suelo. (negative command, ustedes)Don't throw papers on the floor.
¡Juguemos al ajedrez!Let's play chess!
Señor y Señora Valls, ¡compren una nueva lavadora!Mr. and Mrs. Valls, buy a new washing machine!
¡No corran por allí!Don't run over there! ("you" plural formal = "ustedes")
Conduzca despacio. (affirmative command, usted)Drive slowly.
¡Vayan juntos a la fiesta!Go together to the party! (You formal plural.)
¡Salga a la calle!Go out on the street! ("you" singular formal = "usted")
¡Vaya a la escuela! (Usted.)Go to school! (You sing. formal.)
¡Tengan más cuidado!Be more careful! ("you" plural formal = "ustedes")
¡Comamos más rápido! (affirmative command)Let's eat faster!
¡Vayamos al pueblo! (Nosotros/nosotras.)Let's go to the village!
Señorita, ¡cante esa linda canción!Miss, sing that lovely song!
¡No tuerzan a la derecha!Don't turn right! ("you" plural formal)
¡Pongamos música!Let's turn the music on!
¡Limpiemos el coche!Let's clean the car!
¡Hagamos la cena! Let's make dinner! 
¡Tengamos paciencia!Let's be patient!
¡Sean simpáticos!Be nice! ("you" plural formal)
¡Seamos inteligentes!Let's be intelligent!
Señor, ¡no corra!Sir, don't run
¡Tengamos una buena fiesta!Let's have a great party!
¡Tenga el cambio!Here's your change! 
¡Ponga atención!Pay attention! ("you" singular formal = "usted")
¡No comamos tan rápido! (negative command)Let's not eat so fast!
¡Diga la verdad!Tell the truth! 
¡Pongan la radio! Put the radio on! ("you" plural formal = "ustedes")
¡Hagan el trabajo! Do the job! ("you" plural formal = "ustedes")
Señor, firme aquí, por favor. (affirmative command)Sir, sign here, please.
¡Salgan a tiempo!Leave on time!
¡Haga la compra! Do the shopping! ("you" singular formal = "usted")
Señor, no firme aquí. (negative command)Sir, do not sign here.
¡No digan mentiras!Don't tell lies! 
No hablen tan rápido, por favor.Don't speak so fast, please.
¡Hagamos una fiesta!Let's organise a party!
Señoritas, ¡no beban tanto champán! (negative command)Ladies, don't drink so much champaigne!
Señoritas, beban un poco de champán. (affirmative command)Ladies, drink a little champagne.
¡Salgamos esta noche!Let's go out tonight!
Señora Matos, ¡compre lo que hay en la lista!Mrs Matos, buy what's on the list!
¡Pidamos otra ronda!Let's order another round!
¡Hablemos con tranquilidad!Let's talk with calm!
Disminuya la velocidad. (affirmative command, usted)Reduce speed.
¡Vengan a la escuela!Come to school! ("you" plural formal = "ustedes")
¡Amigos, bebamos hasta el amanecer!Friends, let's drink until dawn!
¡Conduzcamos con cuidado!Let's drive carefully!
Disminuya la velocidad. (affirmative command, usted)Reduce speed.
¡Venga a la fiesta!Come to the party! ("you" singular formal = "usted")
¡Chicos, corramos la maratón!Guys, let's run the marathon!
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