Compound subject verb agreement rules refer to the correct usage of verbs when there are two or more subjects in a sentence. It is essential to know and understand these rules to avoid grammatical errors and ensure clear communication in writing.

The basic rule is to use a plural verb when the compound subject refers to two or more people or things performing the same action. For example, ”John and Sarah are going to the party.” The subjects, John and Sarah, are performing the same action of going to the party, so the verb ”are” is plural.

However, there are some exceptions to this rule. When the compound subjects are joined by ”and,” but refer to a single person or thing, use a singular verb. For example, ”Bread and butter is my favorite breakfast.” Bread and butter are two separate things, but together they form a single idea, making the subject singular.

When the compound subjects are joined by ”or” or ”nor,” the verb agrees with the closer subject. For example, ”Neither the dog nor the cat is allowed on the couch.” In this sentence, the closer subject is ”cat,” which is singular, so the verb ”is” is also singular.

Another exception to the rule is when the compound subjects are joined by ”either…or” or ”neither…nor.” In this case, the verb agrees with the second subject. For example, ”Either the teacher or the students are responsible for the mess.” The second subject, ”students,” is plural, so the verb ”are” is also plural.

Lastly, when the compound subjects are joined by ”with,” ”as well as,” or ”along with,” use a singular verb. For example, ”The professor, as well as his research team, has published several studies.” The subject ”professor” is singular, so the verb ”has” is also singular.

In conclusion, it`s important to remember that proper subject verb agreement is crucial in effective communication. By following these compound subject verb agreement rules, writers can avoid grammatical errors and ensure clarity in their writing.