This is a guide to structure-based writing designed to explain why we use the language the way that we do. Rather than a set of inviolable rules, the grammatical norms of English are portrayed more accurately as a way to produce more effective writing. The text and exercises are engaging, and should be considered appropriate for native English speakers as well as intermediate non-native speakers, and beyond. This will be relevant to learners globally, in English speaking and non-English speaking environments, given the high level of penetration of the language in every field.