To be это am, is, are, was, were
1. Today I am very happy, because of a good mark.
2. My brother is impolite. That's why our perents were at school today.
3. They aren't learning at this class, are they?
4. I am disappointed.
5. Why is Mrs. Trincher so angry today?
6. It's strange, but these girls are learning in ninth form.
7. I was at the zoo last weekend. But today we are going to the cinema.
8. He was a doctor in the past. Now he is a boss in the hospital.
9. Our neighbours were at the sea this summer. Why can't we go somewhere, too?
10. Mark (or Lisa если девочка) and I are best friends.