Correct the sentences. All are wrong.

Popraw niewłaściwie napisane zdania.

1. My father is an hairdresser.
2. I am a electrician.
3. I am at a home on a Sunday.
4. On a Saturday I am at a school.
5. My surname is the Smith.
6. You are an professor and you work at a university.
7. This building is school.
8. This is an pen.
9. These are a chairs.
10. We are an electricians.