VERB TO BE 

The “to be” is a verb used to describe something or someone. It can be used to say different things according to the context. However, the most common use of the to be verb is to talk about names, age, feeling, nationalities, and professions, especially when talking in the present tense.

Click on here and you will find the introduction and the present and past form of the verb to be https://www.lingokids.com/english-for-kids/verb-to-be