1. Is our teacher writing sentences at the lesson now?
2. When is our teacher writing sentences?
3. Who is writing sentences at the lesson now?
4. Is our teacher or a student writing sentences at the lesson now?
5. Our teacher is writing sentences at the lesson now, isn’t she?
Is our teacher writing sentences at the lesson now? Общий
Is our teacher writing or reading sentences at the lesson now? Альтернативный
Our teacher is writing sentences at the lesson now, isn’t she? Разделительный