The document provides a detailed guide for improving sentence correctness and effectiveness according to standard written English, emphasizing grammar, punctuation, and clarity. It outlines a step-by-step strategy for identifying and correcting various types of sentence errors, including passive voice, run-on sentences, misplaced modifiers, parallelism issues, and wordiness. Practical examples and question formats are given to demonstrate the approach and encourage critical evaluation of sentence structure in preparation for standardized tests like the SAT.