Answer:
A Linking Verb
Explanation:
The word “is” is always used as a verb in written and spoken English. This word is considered as a verb because it expresses existence or a state of being. It is classified under linking verbs and is a derivative of the verb “to be.” In the sample sentence: He is the most intelligent student in class.
The most common linking verb is the verb to be in all of its forms (am, are, is, was, were, etc.).
