This document discusses prepositions in English. It begins by listing some of the most common prepositions in English: of, to, in, for, with, on. It then defines prepositions as words that show relationships between nouns/pronouns and other words in sentences. Examples of prepositional phrases are provided. The document further explains that prepositional phrases modify nouns/pronouns by answering questions like which, what kind, how many. They can also modify verbs, adjectives or adverbs by answering questions like where, when, how. The final sections discuss how prepositions express spatial and temporal relationships, giving examples of location, direction and temporal prepositions.