This should always be the place to start, take it from Hemingway. The purpose of learning grammar is to produce well-formed sentences. And the best way to learn grammar is to provide opportunities for students to construct ideas. A sentence is simply a collection of words that conveys an idea. When well-crafted sentences are connected wisely, one after another, meaning flows, carrying that idea forward in a clear and concise manner.
One True Sentence is an ongoing opportunity for students to write for real. Over the course of 20 weeks, as they practice the art of constructing sentences, students will acquire tools within the context of activity writing.
All the tools to help upper elementary and middle school students construct sentences using rhetorical techniques that make sentences exceptional.