"Do you have the passport?"
Translation:¿Tienes el pasaporte?
Tú is redundant here as the verb form already indicates it. So, it can be omitted.
I'm just learning, but I think tienes is used with "you" informal while tiene used with he/she/usted (you formal) i.e. tu tienes (you have) ella tiene (she has) note: tengo is I have..If I'm wrong I hope someone lets me know!
I always hear usted being used at the end of sentences. Is that not correct? "Tiene el pasaporte, usted?"
I don't think I'm really qualified to answer this but i think using usted at the end of sentences is acceptable, but only needed in really formal situations. Someone let me know if I'm wrong.