Breakdown of Questo evento è inevitabile, lo deve accettare.
essere
to be
questo
this (masculine)
dovere
must
lo
him/it (direct object)
Questions & Answers about Questo evento è inevitabile, lo deve accettare.
What exactly does lo replace in this sentence?
While it could technically just refer back to the masculine noun evento, it is more natural here to read it as the pro-clausal lo. This means lo replaces the entire preceding fact: the reality that the event is inevitable. You are saying you must accept that it cannot be avoided, rather than just accepting the event itself.
Can I attach lo to the end of the verb instead of putting it before deve?
Yes, you can absolutely say deve accettarlo. When a modal verb like dovere is followed by an infinitive like accettare, pronoun placement is flexible. You can put lo before the conjugated modal verb, or you can attach it to the end of the infinitive after dropping its final -e. Both options mean exactly the same thing.
The translation says "you must", but deve is the third-person singular form. How do we know it means "you"?