Charles E. Sprague

“ THE USE OF PREPOSITIONS In English we often use one of the common prepositions in several different meanings, which may not coincide with the meanings of any one Volapük preposition. In Volapük it is intended that each preposition should have only two meanings, the literal and the figurativ.
The following list is intended for reference in case of doubt :
It must be remembered also that there are many words in English which are used sometimes as prepositions, sometimes as adverbs : to run down the hill; to tear down the house. ”