More specifically, correlative conjunctions are pairs of conjunctions that link two grammatically comparable elements (words, phrases, clauses). The two elements connected by a correlative pair are conceptually similar. In other words, nouns are linked to nouns, adjectives to adjectives, and so on.
o… o =- either… or né… né = neither… nor sia… sia/che = both… and/as well as non solo… ma anche = not only… but also tanto… quanto/come = as… as / both… and e… e = both (with)... and (with)
o… o
The o… o correlative pair is the Italian equivalent of the English either… or. It conveys the idea that only one out of two options will take place, but not both:
O andiamo in Sicilia, o andiamo in Calabria, ma non possiamo andare in entrambi i luoghi. Either we go to Sicily, or we go to Calabria, but we can’t go to both places.