2. A: Is Mary playing computer games?
B: No, she isn't. She's doing her homework.
3. А: Is the dog playing in the garden?
В: No, it isn't. It's sleeping by the fire.
(т.к. мы не знаем пол собаки, ставим it, но возможен и вариант с he/she)
4. A: Are you eating breakfast?
B: No, I'm not. I'm getting dressed.
5. A: Are Sue and Dave doing the shopping?
B: No, they aren't. They're watching TV.
Объяснение: