These two educational posters teach the importance of subject-verb agreement in sentence construction. They emphasize that verbs must match their subjects in number, ensuring grammatical accuracy. For instance, in sentences with plural subjects, such as "dogs," a corresponding plural verb like "bark" should be used. Conversely, when dealing with singular subjects, a singular verb is necessary. An example is the sentence "The mouse looks at the door," demonstrating the correct usage of a singular verb with a singular subject.