Complete the sentences with the forms of the verb "to be". Example: We are back to school.1. ... your friends in the schoolyard?2. ... your favourite teacher at school?3. The children aren't sad. They happy.4. He isn't at school. He at home.5. Our first lesson ... Maths. It isn't English6. she late? Yes, she7. Hurry up! It ... time to go to the classroom.8. Our friends aren't in the schoolyard. They in the classroom