use a/an Posted on 4th September 20156th September 2015 by DoubleClick A. to say what kind of thing or person something/somebody is, or plural noun A1. use a noun the first time B. use a/an when you say what somebody’s job is e.g. a teacher C. We say that somebody has a long nose/ a nice face/ blue eyes (a part of body) D. once a week/ three times a day/ $1.5 a kilo Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Posted in Article and tagged A/An, Grammar.