4 Mike's elder sister was on the phone all morning. (talk to mum or Sandy)

Краткое пояснение:

Пошаговое решение:

1. Шаг 1: Формулируем вопрос, используя предложенные варианты "talk to mum" и "talk to Sandy". Вопрос: "Was Mike's elder sister talking to mum or Sandy?"
2. Шаг 2: Формулируем первый tag-вопрос. Утверждение: "Mike's elder sister was talking to mum." Tag-вопрос: "Mike's elder sister was talking to mum, wasn't she?"
3. Шаг 3: Формулируем второй tag-вопрос. Отрицание: "Mike's elder sister was not talking to Sandy." Tag-вопрос: "Mike's elder sister was not talking to Sandy, was she?"

Ответ:

• Вопрос: Was Mike's elder sister talking to mum or Sandy?
• Tag-вопросы: Mike's elder sister was talking to mum, wasn't she? Mike's elder sister was not talking to Sandy, was she?