Years ago, a new student walked into my class. She was nervous. I said, 'Hello, what is your name?' She said, 'My name... Maria.'
I smiled. I said, 'My name IS Maria.' She tried again: 'My name is Maria.' I said, 'I am Mr. Gee. You are Maria. She is my student.' I pointed at the wall. 'That is a clock. These are books.'
By the end of the lesson, Maria was making her own sentences. 'I am from Brazil. My brother is in Sao Paulo. My sisters are at school. We are tired today.'
That is all 'to be' is. A small word that connects you to a description: a name, a place, a feeling, a job, a thing. Once you have this, English starts to feel like a friend, not a stranger.