The Italian prepositions per, su, con, and fra/tra stand for many different words and are used in a variety of grammatical constructions. The preposition per ("for" in English) is used to indicate the following:

1. Movement through space:

Sono passati per Roma. (They passed through Rome.)

Sono passati per Londra. (They passed through London.)

2. Duration of time:

Ho lavorato per un anno intero. (I worked for an entire year.)

Ho lavorato per due giorni senza una pausa. (I worked for two days without a break.)