Поставьте следующие предложения в отрицательную и вопросительную форму

1. My friend is not a teacher. Is your friend a teacher? 2. We don't work at this office. Do we work at this office? 3. He doesn't live in the centre of Moscow. Does he live in the centre of Moscow? 4. They haven't their German in the morning. Have they their German in the morning? 5. Ann is not in her room now. Is Ann in her room?