What are the two essential components of a complete sentence?

A complete sentence is fundamentally composed of a subject and a predicate. The subject refers to who or what the sentence is about, while the predicate provides information about the subject, typically including a verb that describes an action or state of being. For instance, in the sentence "The dog barks," "The dog" is the subject, and "barks" is the predicate that describes what the subject does.

The other choices do not encompass both elements required for a complete sentence. While nouns and verbs serve critical roles in constructing sentences, merely having these does not fulfill the criteria of a complete sentence, as they must be organized into a subject-predicate structure. Similarly, a conjunction connects clauses or phrases but is not by itself a necessary component of a complete sentence. The term "supplement" is not commonly used in grammar to refer to any of the essential components of a complete sentence. Thus, recognizing the relationship between the subject and predicate is key to understanding sentence structure.