Ako pogriješiš u adresi, paket neće stići.

not

Breakdown of Ako pogriješiš u adresi, paket neće stići.

• u: in
• htjeti: will (future auxiliary)
• ako: if

Questions & Answers about Ako pogriješiš u adresi, paket neće stići.

Why is it pogriješiš and not pogriješuješ / pogriješiš ćeš or something “more future”?

Pogriješiš is the 2nd person singular present of the perfective verb pogriješiti (to make a mistake). In Croatian, the present of a perfective verb often refers to a future action when the context is future/conditional—especially after ako (if/when).
So ako pogriješiš… naturally means if you make a mistake… (at some point in the future).

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What case is adresi and why?

Adresi is locative singular of adresa. The preposition u commonly takes:

• locative for “in/within” (location/field): u adresi = in the address / in the address details
• accusative for motion “into”: u adresu (not the meaning here)

Here it’s like saying there’s an error in the address information, so u + locative fits.

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Could I also say Ako pogriješiš adresu… (without u)?