The 'principal parts' of the verb “write” include the infinitive “write,” the past tense “wrote,” the past participle “written,” and the present participle “writing.”
Our monthly mortgage payment covers the interest on our loan as well as some of the 'principal'.
My 'principal' [='main'] reason for moving is to have a shorter drive to work.
(..) Yeah, so the judges can give out the prizes for best costume. You know, most frightening, most authentic, most accurate visualization of a scientific principal. Oh, Sheldon, I'm sorry, but there aren't going to be any parades or judges or prizes. This party is just going to suck. (..)2007 TvShow: The Big Bang Theory Title: The Middle Earth Paradigm Season: 1 Episode 6