Записать предложение в past progressive 1) в антернативный вопрос 2) вопрос к подлежащиму 3)специальный и раздельный вопрос: в предложение _ she was writing a lettle to her friend whtn he phoned

1. Was she writing a letter to her friend or to her grandmother when he phoned?
2. Who was writing a letter to a friend when he phoned?
3. What was she doing when he phoned?
4. She was writing a letter to her friend when he phoned, wasn't she?