* Sentences need a subject: A subject is the person, place, or thing that performs the action of the verb. For example, in "The dog barked," "dog" is the subject.
* Verbs describe actions or states of being: They tell us what the subject is doing or what condition it's in.
* A complete sentence needs both a subject and a verb to express a complete thought.
Examples:
* "Barked" is not a sentence because it lacks a subject. We don't know who or what is barking.
* "Running" is not a sentence because it lacks a subject. We don't know who or what is running.
However, there are some situations where a verb might *appear* to be a complete sentence:
* Imperative sentences: These are commands or requests, and they often omit the subject "you." For example:
* "Go!" (You go)
* "Close the door." (You close the door)
* Short, informal expressions: Sometimes people use single words in casual conversation, but these are not grammatically correct sentences. For example:
* "Ouch!"
* "Help!"
In summary: While verbs can appear to stand alone in certain situations, they always need a subject to form a complete sentence.