A B1–B2 writing lesson about opinion essays that helps students move beyond basic phrases like “I think” and develop clear, well-structured arguments in semi-formal writing. Students analyse model essays on shopping and advertising, explore how to organise ideas into paragraphs, and learn useful expressions for introducing opinions, supporting arguments, giving examples, and presenting opposing views. The lesson includes guided writing practice, sentence transformations, error correction, and a final 140–190-word opinion essay task with a detailed self-check checklist.