Sir, <br/><br/><br/>He is a doctor. <br/><br/><br/>here the word "is" is main verb. Here it is functioning as linking verb or couplar verb. <br/><br/>My doubt is that the verb "is" is a transitive verb ? <br/><br/>What about the word "a doctor" <br/><br/>is it subject complement or verb complement. <br/><br/><br/>Thanks. <br/>