Temporal actions (al + infinitive)

Temporal actions with al + infinitive

To express "upon doing something" or "when doing something," Spanish uses al followed by an infinitive verb. This links two events that happen at the same time or consecutively.

Upon preparing the fishing rod, one must use a good bait.
Al preparar la caña, hay que usar una buena carnada.

Because the infinitive doesn't indicate tense, the main verb sets the timeframe for the whole sentence:

Upon putting the bait on the hook, I lost it.
Al poner la carnada en el anzuelo, la perdí.
Upon returning to the deck, the sailor cleans the tuna.
Al regresar a la cubierta, el marinero limpia el atún.

Word order

An al + infinitive phrase often appears at the beginning of a sentence, but it can also follow the main clause:

I was about to release the reel upon seeing the fishing line.
Yo estaba por soltar el carrete al ver el sedal.
One must be careful upon touching the hook with the bait.
Hay que tener cuidado al tocar el anzuelo con la carnada.