A Preposition is a word which shows relationship among other words in the sentence. The relationships include direction, place time, cause, manner and amount. A preposition comes before a noun or pronoun. , , A preposition phrase contains a preposition and object. Prepositional phrases are like idioms and are best learned through listening to and reading as much as possible, Little Red Book of Prepositions is a ready reference book with a check list of propositions.