This document provides an overview of prepositions in English. It defines prepositions as words that connect nouns, pronouns, and phrases in a sentence by indicating their relationship. Examples are given such as "on the table". The document then categorizes different types of prepositions, including simple prepositions consisting of one word, double prepositions combining two words or simple prepositions, compound prepositions consisting of two words, participle prepositions ending in "en" or "ing", and phrase prepositions that modify nouns, verbs or sentences.