Plural reflexive commands

When giving instructions to a group of people in Spain, you use the vosotros command form.

To form a regular affirmative vosotros command, replace the final -r of the infinitive with a -d (poner becomes poned, sentar becomes sentad).

Reflexive verbs

When the verb is reflexive, attach the pronoun os to the end of the command. Crucially, you must drop the -d before adding -os.

For example, to tell a group to sit down, take the command sentad, drop the -d, and add -os to get sentaos (never sentados). Similarly, poned becomes poneos.

Sit down there and hold on well.
Sentaos ahí y agarraos bien.
Girls, put on the harness now.
Chicas, poneos el arnés ahora.

Just drop the -d and add -os!

Stay still until the end.
Quedaos quietos hasta el final.
Unbuckle your seatbelts and stand up.
Desabrochaos el cinturón y levantaos.