Learn Italian: Andranno dall'astrologo per sapere il loro destino. - They will go to the astrologer to know their destiny.

It is the "they" form of the future tense for andare (to go). Andare is an irregular verb because it drops the "e" from its future stem, making it andr- instead of "ander-". Adding the "they" ending -anno gives us andranno (they will go).

Why do we use dall' instead of all' for "to the astrologer"?

When you go "to" a person or their workplace (like a doctor, an astrologer, or a friend) in Italian, you must use the preposition da, not a. Since astrologo starts with a vowel, da combines with the article l' to become dall'.

Since the lesson is about irregular future verbs, why isn't sapere in the future tense here too?

Because it follows per (in order to). In Italian, when you do an action "in order to" do something else, you use per followed by the infinitive (the base dictionary form of the verb). So, per sapere simply means "to know" or "in order to know".

Why is there an il before loro destino?