I have to admit that I was a bit surprised when my ex-wife listed off Spanish prepositions to discover that it excludes a lot of words I would have thought were

I have to admit that I was a bit surprised when my ex-wife listed off Spanish prepositions to discover that it excludes a lot of words I would have thought were prepositions but Spanish considers adverbs and only become prepositional when used in conjunction with one of the enumerated prepositions, usually (always?) de.