Learn Spanish (Spain): Esta tarde nos hemos bebido la jarra entera. - This afternoon we have drunk up the entire pitcher.

The pronoun nos here is the aspectual 'se' (conjugated for nosotros). While hemos bebido just means 'we have drunk', adding nos changes the meaning to 'we drank up' or 'we finished off'. It emphasizes that the entire amount of the drink was consumed.

Does the aspectual nos mean we always have to mention exactly what we drank?

Yes! When you use verbs of consumption like beberse or comerse, you must include a specific, quantified object. You can say Nos hemos bebido la jarra entera (We drank the whole pitcher), but you cannot just say Nos hemos bebido (We drank up) without stating what was finished.

If the pitcher is already finished, why use the present perfect (hemos bebido) instead of the preterite (bebimos)?

In Spain, the present perfect is used for actions that happened in a time period that isn't over yet. Because esta tarde (this afternoon) is considered an unfinished time frame from the speaker's perspective today, you use hemos bebido. If it were yesterday, you would use the preterite: Ayer nos bebimos la jarra entera.

Can I use toda instead of entera to mean 'the entire pitcher'?