This article draws on research into using reader-response theory as a way of thinking about teaching grammar and poetry in the English classroom. Framing my discussion around world-based models of reader-response such as Transactional Theory (Rosenblatt 1938, 1978) and Text World Theory (Gavins 2007; Werth 1999), I argue that this approach is useful in that it foregrounds the creative nature of reading whilst providing a systematic way of analysing language. I analyse data from a series of Key Stage 3 poetry lessons, showing how world-based approaches provide a "concept-driven pedagogical tool" for the teaching of grammar, giving KS3 students the opportunity to build and develop on KS2 grammatical knowledge. I also show how this approach helped to produce authentic responses to literature and generated meta-reflective discussions on the reading process. I argue that this approach offers an intuitive, accessible and contextualised method for exploring how language and grammar work.