The verb "to be" 

In the last class the teacher explained the structure of verb to be in present.To begin the verb to be means "ser" or "estar". We use to be in present to talk about names, professions, nationalities, age, feelings. The forms of the verb to be are: am, is, are.

The structure of the verb to be in the following:

Subject + Verb to be + Complement

(am, is, are)