ABSTRACT
In many languages prepositions are used to show aspects of location of an event, whether something happened, for example, in, on, at or near my house. English has a rather extensive set of such prepositions and uses them to carry meaning for which other languages commonly use nouns or verbs. Some of the prepositions that show aspects of an event's location are also used to show its temporal aspects, forming adverbials of time. Prepositions are necessary first and foremost to limit the event depicted by a verb, in space and in time, by combining with a nominal that refers to the limits. Some prepositions attract the beat of the rhythm of the sentence, so they are stressed or emphasized. People can call them 'emphatic' or strong prepositions; they are used when the relationship described by the preposition is important to the message.
