Odpowiedź:
2. Is Julia looking after her younger brother on the playground? No, she isn't. She's chatting on her mobile in the school office.
3. Is Oliver playing chess in the computer room? No he isn't. He's looking after his younger brother on the playground.
4. Are Callum and Isaac chatting on their mobiles in the school office? No, they aren't. They're dancing in the gym.