posted by nick .
were learning about affirmative/negative usted/tu commands and on the model it says "Tenemos pelo sucio. (el perfume)" and then the answer is "no lo compren" why compren, why not compre?
Look at the endings.... Is one singular and one plural? Is tenemos singular or plural?
It will be that easy = singular or plural.
If you are speaking to one person, saying don't buy: no compres (tú) and no compre (usted)
If you are speaking to more than one person = no compréis (vosotros) but no compren ustedes)
That's it for the negative, HOWEVER the affirmative command for tú is just like the 3rd-person singular of the Present tense.
Compra (tú) but Compre (usted)
Comprad (vosotros) but Compren (ustedes)