1. Отрицательный - Children
aren't singing a song at the concert now.
2. Вопрос: Общий - Are children singing
a song at the concert now?
3. Вопрос: альтернативный - Are
children singing a song at the concert or at the party now?
4. Вопрос: специальный – Where are
children singing a song?
5. Вопрос: вопрос к
подлежащиму – Who is
singing a song at the concert now?