The verbs to do , to have , and to be are verbs that can be used

“To be” verb is mainly used to indicate and identify this verb tense present and the applying –ing of the present participle of the verb word used in the sentence. The present progressive tense is a verb tense that means the action is continuing or in the act right now.

Example:
She is having an affair.
She wants to be famous.
She likes to have a baby.