Actions about to happen (estar por)

To describe an action on the verge of happening, use the phrase estar por ("to be about to").

Conjugate the verb estar to match the subject, and follow it with por plus an infinitive verb.

It is the eve and we are very excited because the year is about to end.
Es la víspera y estamos muy emocionados porque el año está por terminar.
The clock is about to strike the twelve chimes and we have the grapes.
El reloj está por dar las doce campanadas y tenemos las uvas.

While estar changes to match who or what is doing the action, por and the infinitive remain unchanged.

The guests are about to celebrate and I just served the champagne.
Los invitados están por festejar y yo acabo de servir la champaña.
We are about to hear the last chime and give each other the hug.
Estamos por escuchar la última campanada y darnos el abrazo.