This is a free, interactive, Flash-type lesson on diagramming sentences from the Wisconsin Technical College System, and the best internet resource I’ve seen so far on the subject. The lessons take you step by step from diagramming a basic sentence to more complicated sentence structures. A great learning object, especially for visual or kinesthetic learners. This website contains over 2000 of these Flash-type learning objects on a multitude of subjects of interest to middle and high-schoolers.
December 19, 2009 -- From ddsharper, a reader from USA, who is not affiliated with the site.
Excellent site for learning how to diagram sentences. A place to upload your diagrams and share them with the world.
April 15, 2009 -- From Elizabeth, a teacher, from Saint Paul, Minnesota, who is affiliated with the site.
The best and most fun way to learn English grammar is through sentence diagramming! This site has lessons and exercises covering the parts of speech, sentence types, and plenty of examples of sentence diagrams.