Разделительный вопрос.
1.The river Nile flows into the Mediterranean Sea, doesn`t it?
2.They always argue, don`t they?
3.I usually go to work by car, don`t I?
Вопрос к подлежащему.
1. What flows into the Mediterranean Sea? (What river flows into the Mediterranean Sea?)
2. Who always argues?
3. Who usually goes to work by car?