A complete sentence must have both a subject and what else?

A complete sentence must include both a subject and a verb. The subject is the part of the sentence that indicates who or what the sentence is about, while the verb expresses what the subject is doing or describes a state of being. This structural requirement is essential for creating a meaningful statement.

For example, in the sentence "The cat sleeps," "The cat" serves as the subject and "sleeps" is the verb. Without a verb, the sentence would be incomplete and lacking in the necessary action or state of being. This fundamental rule of sentence structure is crucial for effectively conveying thoughts and ensuring clarity in written communication.