"You come from home."
Translation:Tu domo venis.
Nouns that use the locative (cities, towns, small islands [usually only have one city or town on them], and a few other nouns like domus) will drop the preposition.
Nouns that do not use the locative (like urbs) will not (or at least not normally if there are any weird cases I am forgetting).
i would love it if there were some kind of help text associated with the lessons here... reading stuff like this would help make sense of the locatives the first time through. thanks for the comment.