What is a preposition?


Prepositions come before nouns (usually) giving information about relationships or place. Examples include down, in, behind, before, after, below, beside, outside, up, into, over, during, until, on, off, and with.
The easiest way to select the right preposition is to look up the key noun in a Concordance and check both frequency of collocation (words that habitually go together) and example use (i.e. how it is used by other people), both of which are key purposes of a Concordance. To do this easily and quickly, use the Mechanical Engineering Corpus with AntConc or AdTAT.