1. Did my friends pass the examinations two days ago? - Общий
2. When did my friends pass the examinations? - Специальный
3. Did my friends pass the examinations two or three days ago? - Альтернативный
4. My friends passed the examinations two days ago, didn't they? - Разделительный
5. Who passed the examinations two days ago? - Вопрос к подлежащему