In this video, the teacher explains how to write a body paragraph when answering a prompt. They emphasize the importance of connecting supporting information to the thesis statement and prompt, and provide a step-by-step guide on how to structure a body paragraph. The teacher uses the example of persuading the teacher to take the class to the zoo for a field trip and demonstrates how to write a well-organized body paragraph with a clear topic sentence, supporting details, and a concluding sentence. Overall, this video provides a helpful guide for students to effectively write body paragraphs.