Answer:
A linking verb connects the subject with a word that gives information about the subject, such as a condition or relationship. They do not show any action; they simply link the subject with the rest of the sentence. The most common linking verbs are forms of the verb to be: am, is, are, was, were, being, been.
An action verb explains what the subject of the sentence is doing or has done.
A helping verb helps out the main verb in a sentence.