Elements of Style / Strunk and White
Too often, English teachers make the English language more complicated than it needs to be. Not so with the late Prof. William Strunk Jr., who originally authored this work to use with his classes at Cornell University in the early 1900's. Although the original 43-page digest has "swelled" to a whopping 85 pages, the essence of the book remains a strong case for cleanliness, accuracy, and brevity. Think of this as a concise rulebook for English. Rules are given, followed by examples of improper and proper usage. If you could only have one book on language usage, this should be it.
These materials are resources for the teacher or student, offering instruction and ideas for teaching children to write but not providing "in-book" assignments/practice.