Learn Italian: Inizia a lavorare fra due giorni. - She starts working in two days.

In Italian, when you want to say that something will happen at a specific point in the future (like "in two days" or "in a week"), you use fra or tra. If you used the Italian word in instead, it would mean the action itself takes two days to complete, rather than happening two days from now.

Could I say tra due giorni instead of fra due giorni?

Yes, absolutely! The prepositions tra and fra mean the exact same thing when talking about a future time. Italians just pick whichever one sounds better next to the surrounding words to avoid repeating the same sounds (for example, avoiding tra tre giorni and saying fra tre giorni instead).

Why is there an a before lavorare?

Many Italian verbs require a specific preposition to link them to a second verb in its basic dictionary form (like lavorare). The verb iniziare (to start) is one of these—it always uses a. Whenever you "start doing something" in Italian, the pattern is iniziare a plus the action verb.

There is no word for "she" in the Italian sentence. How do we know it means "She starts"?

In Italian, the subject pronoun is usually dropped because the verb ending already tells us who is doing the action. Inizia is the third-person singular form, so it can mean he starts, she starts, or it starts. The translation says "She starts" based on the context of a wider conversation, but without context, "He starts" would also be a perfectly correct translation.