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A prepositional adverb is a word – mainly a particle – which is very similar in its form to a preposition but functions as an adverb. Prepositional adverbs occur, for example, in English, German and Dutch. Unlike real prepositions, they occur mainly at the end of a phrase and not before nouns. They also modify the verb, which a preposition does not.
An example of a prepositional adverb in English is inside in He peeked inside.