Can a preposition precede a verb?
A preposition is followed by a "noun". It is NEVER followed by a verb.
Do prepositions need to be repeated?
When prepositional phrases are used in a parallel series, prepositions (with, to, of, over, under, by, etc.) should be repeated with every element of the series unless all elements use the same preposition. A common error is to repeat prepositions unnecessarily, resulting in a stilted style.