Prepositions: Locators in Time and Place. A preposition describes a relationship between other words in a sentence.
In itself, a word like "in" or "after" is rather meaningless and hard to define in mere words. For instance, when you do try to define a preposition like "in" or "between" or "on," you invariably use your hands to show how something is situated in relationship to something else. Prepositions are nearly always combined with other words in structures called prepositional phrases.
What are Prepositions? - English Grammar The Easy Way. Prepositions.pdf (application/pdf Object) The Preposition. English Grammar: Preposition. Prepos.pdf (application/pdf Object)