Explain the concept of agreement in case of compound subjects.

In grammar, agreement refers to the correspondence between different parts of a sentence, such as the subject and the verb. When it comes to compound subjects, agreement involves ensuring that the verb agrees with the number and person of the compound subject.

In the case of compound subjects, which are formed by joining two or more nouns or pronouns with coordinating conjunctions like "and," "or," or "nor," the verb must agree with the subject in terms of number (singular or plural) and person (first, second, or third).

To determine the agreement in compound subjects, follow these guidelines:

1. If the compound subject is joined by "and," the verb should be plural. For example: "John and Sarah are going to the party."

2. If the compound subject is joined by "or" or "nor," the verb agrees with the subject closest to it. For example: "Neither the cat nor the dog is allowed on the couch."

3. If the compound subject consists of singular and plural nouns or pronouns joined by "or" or "nor," the verb agrees with the noun or pronoun closest to it. For example: "Either the students or the teacher is responsible for the project."

4. If the compound subject is joined by "either...or" or "neither...nor," the verb agrees with the noun or pronoun closest to it. For example: "Neither the book nor the magazines are mine."

5. If the compound subject is joined by "both...and," the verb should be plural. For example: "Both the cat and the dog are sleeping."

Remember, maintaining agreement in compound subjects is crucial for ensuring grammatical correctness and clarity in writing.