Prepositions + adjectives = boring post

Recently, I received this question:

When an adjective governs case and is followed by a prepositional phrase, where is it placed in the sentence?

Here is my reply:

As for adjectives, watch the nouns and the prepositions closely.  

If there is no preposition, the noun determines the case.  But, you are used to that.  

If the adjective is inside a prepositional phrase with the object of the preposition… then, the preposition determines the case.  

If, for example, we were in a large beautiful house, the object of the preposition and the adjectives would all be ablative.  We would be in casa bella et magna.  

If (and your mother would not approve) we were running through the house, the object of the preposition and the adjectives would be in the accusative case.  We would be running per casam magnam et bellam.  

We would also be in trouble… but, that has nothing to do with Latin grammar.