Preposition and postposition - Wikipedia
https://en.wikipedia.org/wiki/Preposition_and_postpositionPrepositions and postpositions, together called adpositions (or broadly, in English, simply prepositions), are a class of words used to express spatial or temporal relations (in, under, towards, before) or mark various semantic roles (of, for). A preposition or postposition typically combines with a noun phrase, this being called its complement, or sometimes object. A preposition comes before its complement; a postposition c…