This document defines and provides examples of different types of prepositions in English. It begins by defining prepositions as words that link nouns and pronouns to other words and express relationships between them. It then discusses simple prepositions, compound prepositions formed by combining words, phrase prepositions which are groups of words, and participle prepositions which are present participles of verbs. Finally, it provides many examples of prepositions expressing relations of place, time, agency, manner and more.