Ответ:

1 They are plying football (В самом задании ошибка, артикль с видами спорта не употребляется!!!)

They aren't plying football

Are they playing football?

2. He is singing

He isn't singing

Is he singing?

3 She is reading a book

She isn't reading a book

Is she reading a book?

4 Tom is jumping

Tom isn't jumping

Is Tom jumping?

5 My mum is cooking a cake for me

My mum isn't cooking a cake for me

Is my mum cooking a cake for me?

6 Martin is playing the guitar

Martin isn't playing the guitar

Is Martin playing the guitar?

Объяснение: