This site is dedicated to the tool of learning--sentence diagramming--in particular, and to learning in general. "Grammar is the logic of speech, even as logic is the grammar of reason," said Richard Chenevix Trench in On the Study of Words, (1858). Grammar, logic, and rhetoric are collectively called the trivium, which is discussed in an influential essay by Dorothy Sayers. To learn more, read my blog, check the recommended books, and visit the bookstore. Also check this SAT tutor.