Объяснение:
To be - это is, am или are.
is - употребляем с he, she, it. Например, she is a beautiful girl. He is a student. It is my house.
am употребляем с I. Например, I am the smallest girl in our class.
are используем с you, we they. Например, they are my friends, you are nice girl, we are classmates.