A complete sentence must have the following basic requirements:
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Subject: A subject indicates who or what the sentence is about. It can be a noun (a person, place, thing, or idea) or a pronoun.
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Predicate: The predicate provides information about the subject, typically containing a verb that expresses the action or state of being of the subject.
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Expresses a Complete Thought: A complete sentence conveys a clear and complete idea, meaning it doesn’t leave the reader hanging or require additional information to understand it.
For example, the sentence "The cat sleeps." has a subject ("The cat”), a verb ("sleeps”), and expresses a complete thought.