Base verb: be
Present tense: singular = am, is, plural = are
Past tense: singular = was, plural = were
Participles: past = been, present = being
The present forms of the verb "to have" are: I have You have He/she/it has We have They have
Category is not a verb. Categorize is a verb its forms are: categorize categorizes categorized categorizing
'Have' is of the verb 'to have'. 'is' is of the verb 'to be'.
The noun forms of the verb to infect are infector, infection, and the gerund, infecting.The adjective forms of the verb to infect are infectedand infecting.
a verb
a verb
The past participle forms of the verb "be" are "been" and "being".
They are all singular verb forms.
Verb conjugation
The verb 'was' is a helping verb. It belongs with other forms of the verb 'be'.
They are different forms of the verb "to be" in the present simple tense: I am a techer. They are doctors. The verb to be most frequently works in conjunction with another verb: I am writing a letter. We are playing in the garden.These are the different forms of the verb to be for the different persons:I am, You are, He/she/it is, we are, you are, they are.
Popular is not a verb and does not have verb forms.