seem unnecessary (like “hashtag,” “selfie,” and “tweep” in 2014), but this practice recognizes that culture, and language with it, is constantly in flux. You may notice, as will be illustrated through this book, that the words and forms that are used most frequently in most languages are often the most irregular, breaking the normal patterns of usage. For example, most verbs in English do not change their form significantly when their subject changes (e.g., I run, you run, he runs). Common verbs,