Ответ:
Сразу говорю, на 100 % не уверена, но вроде как правильно)
2. Are you sitting in this chair? No, it's not
3. Are we downloading music from internet? Yes, it is
4. Are you mum watching TV? No, it's not
5. Are they studying for exams? Yes, it is
6. Am I playing tennis well? No it's not
Объяснение:
Are-множественое число
Am- глагол to be, используется ТОЛЬКО с I