Definition — A preposition is a word used with a noun or pronoun to show its relation with some other word/words in the sentence.
II. Kinds of Prepositions — Generally prepositions are classified in two forms
1. Common or Simple Prepositions
2. Complex Prepositions
1 Common or simple Prepositions are : on, at, of, off, to, in, into, for, from, up, with, without, ever , past, since, till, until, about, above, after, along, around, down, by, during , before, between, among, beside, upon, over, through, under etc.