Just like countries, words can be at war with each other. It's the writer's job to sort out what form subjects, verbs, and other parts of speech must take to make a coherent sentence. Readers will learn many of the rules of subject-verb agreement, including those regarding compound subjects and helping verbs. The many examples use familiar situations to introduce the agreement concepts, while fact boxes highlight additional information. Vivid photographs will infuse the main content with color and fun to engage readers with knowledge supporting the common core English language standards.