A preposition is a word or prepositions are a group of word that create a relation between words and they are used before a noun, pronoun, or a noun phrase to show direction, time, place, location, spatial relationships, or to introduce an object . How to use prepositi ons correctly. 1.Prepositions must have an object. Without an object, the preposition is merely an adverb. E.g. She is in the room . (The preposition in has an object the room.) 2.Must be placed before. It comes before a noun or pronoun and it's object, but not always. E.g. She placed the pen in the bag. (In has an object box, and in is placed before box.) 3.The pronoun following the preposition should be an object form. It forms a prepositional object. If a pronoun is following a preposition, it should be in the objective form (me, her, them) and not the subjective form (I, she, they, etc). E.g. The secret is between me and you. 4.Prepositions form. Prepositions have no form. Most prepositions are...