The word “is” is always used as a verb in written and spoken English.

1. Verb

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 word “is” serves as a linking verb because it connects the subject “he” with the predicate “the most intelligent student in class.”

Definition:

a. third person singular present of be

• Example:
• Marissa is thirteen years old.