Look in any grammar textbook, and you will find the simplest and most vapid sentences with no context, no style, none of the rhetorical elements that characterized grammar in the Greek and Roman origins of grammar teaching. Consider:
Bob threw the ball over the house.
Judy wrote to her mother.
The tiny kitten hissed at the big dog.
The carpenter's price sounded reasonable.
You get the idea. A "dummy" sentence made up to illustrate an aspect of sentence structure.
Contrast this to sentences that were written to say something in the real world:
You reap what you sow.
Half a loaf is better than none.
He not busy being born is busy dying.
All great truths begin as blasphemies.
Letting people in is largely a matter of not expending the energy to keep them out.
If you want to make an omelet, you have to break some eggs.
Sources for such authentic sentences include *1*quotations, *1*haiku, *1*epigrams, *1*proverbs, limericks, *1*bumper stickers, *1*short poems, *1*one-liners, Yo Mama Jokes and selected passages from literature. Constance Hale has written Sin and Syntax (Broadway Books, 1999) using literary and newspaper sentences to illustrate grammatical and style points. Using sentences with sense works with any of the approaches described in the sites below. The infusion of meaning into all the skills work and standardized test preparation is needed to counter the literal dumbing down effect of much that is currently taking place in public education. We don't need to "sentence our students to death."
Free Spelling Course -- "This free, thirty unit spelling course has been made available courtesy of Marie Rackham, author and producer of The Basic Cozy Grammar Course, The Basic Cozy Punctuation Course and The Cozy Classroom CD."