The "To be" verb is basically used to describe someone or something. In English, it can be used to express different things which are in accordance with the context. The most common use of the verb "to be" is to talk about nationality, names, age, feelings and professions, especially when talking in the present tense.
The easiest way to learn tense effectively
Use of 'to be' in different situation
The simplest way to answer taq question