What is ablative vs accusative?
New grammar
“In” with the accusative means into, onto, against... it has the idea of forward motion, whereas “in” with the ablative denotes simply position, in or on. “Sub” can also take both cases.
What are examples of ablative case?
The ablative case is very frequently used with prepositions, for example ex urbe "out of the city", cum eō "with him". Four prepositions (in "in/into", sub "under/to the foot of", subter "under", super "over") may take either an accusative or an ablative.