Comedian Dave Chappelle has said, “Every black American is bilingual. We speak street vernacular, and we speak job interview.” As Chappelle understands, English comes in many varieties that differ from one another in pronunciation, vocabulary, usage, and grammar. You probably already adjust the variety of language you use depending on how well—and how formally—you know the audience you are addressing. Adding language variety to your writing can improve your communication with your audience if you think carefully about the effect you want to achieve.