Many students struggle with the idea of writing a topic sentence. They don't understand how important the topic sentence is to give the reader context. This PowerPoint presentation uses the metaphor of a box to teach students that your topic sentence is like a "box" (main idea) and the details are like the contents. The slides follow the "gradual release of responsibility" model, starting with guided practice. Then each slide features a "turn and talk" with directions for both partners. Finally, the last slide gives them a prompt to write a paragraph.