dlb wrote:If I see a prepositon &/or a prepositional phrase will it's presence automatically dictate the ablative case?
benissimus wrote:I wouldn't worry about a preposition taking any other case than accusative and ablative until you run into it (which won't be for a long time), which makes things a lot easier than if you were just starting Greek!
Prepositions that express something stationary, like location, usually take the ablative. Prepositions that express motion, provided that it is motion away, also take the ablative (in fact this is the original use of the ablative, and sometimes does not require a preposition at all). Some examples of prepositions in this category would be in, de, ex, and ab.
Prepositions that express motion towards usually take the accusative. Some prepositions that have no obvious relation to motion, but express an inter-relationship between several things also take the accusative. Some examples are ad, in (here "into"), contra, inter, and trans (these last two usually express relationships, not motion).