What Are the Rules of Subject-Verb Agreement? I would like to say that headline writers for newspapers must condense the main idea of a news story into short clauses. These headlines often include only a subject, a verb, and an object or phrase:“Senators Oppose Tax Bill.” The headline writer must make sure that the subject of the headline and its verb agree in number. So, it is very important for the students to study the rules of Subject-Verb Agreement. In the following file, you will find 20 rules provided with examples for Subject-Verb Agreement.