Subject: The subject is the noun or pronoun that performs the action of the verb in a sentence, forming one half of the basic subject-verb-object structure.
Transitive Verb: A transitive verb is a verb that requires one or more objects to complete its meaning, indicating an action that is done to someone or something.
Complement: A complement is a word or group of words that completes the meaning of a predicate, which can include objects but also includes other forms like subject complements.