In disjoint compound subjects, the subjects are unrelated and not acting as a single unit.

Let's look at an example: "Either pizza or burgers." Now, what should the verb be in this sentence: "Either pizza or burgers is/are on the menu tonight"?

collective subjects represent groups of people, animals, or things acting together as a single unit. Who can tell me what verb should be in this sentence: The family is/are planning a vacation

Coordinate Compound Subjects: This is the most common type, where two or more subjects are listed together using "and."

“John and Mary are studying for their exams.”

Explanation: In this case, "John" and "Mary" are two separate individuals who are each studying for their exams, making them coordinate compound subjects.

“The dog barks loudly every morning.

In this sentence”, "dog" is a singular subject, so the verb "barks" is also in the singular form to agree with it.

Plural Subject and Verb:

“The dogs bark loudly every morning.” Here, "dogs" is a plural subject, so the verb "bark" is in the plural form to agree with it.