This lesson plan focuses on teaching students about using the past simple tense. It includes activities like watching a song video that explains regular and irregular past verb forms, completing a presentation about the past simple tense including affirmative and negative forms, and having students write a short paragraph about what they did last weekend using past tense verbs. The expected outcomes are that students will be able to distinguish between affirmative and negative past simple forms and write about past events using this tense.