The preposition in the sentence above is beside because it adds additional detail or information to the statement. Prepositions are very important parts or features of a statement because they give necessary and important information in the sentence making it more comprehensible. These are words that simply introduce details to the readers. However, prepositions are not stand-alone in a sentence because it works best in a group that is called prepositional phrase. Prepositions can either give additional information or make the statement easy to understand.