Manipulating sentences is a sophisticated skill for writers to help make their writing flow smoothly. Young writers can start thinking about their sentences when we explicitly teach them specific moves about sentences. This PPT. lesson introduces the idea of compound sentences to student writers. It clearly defines what a sentence is and highlights the difference between simple sentences and compound sentences. The lesson contains a writing sample to help illustrate the teaching point. The lesson is connected to the book, The Writing Diner, by Tim Hargis.