Correcting the sentences using Present Continuous:

1. Jack and Sarah are skateboarding. (skate)
   Jack and Sarah aren't skateboarding. They're skating. (Джек и Сара не катаются на скейтборде. Они катаются на коньках.)
2. Those dogs are fighting. (play)
   Those dogs aren't fighting. They're playing. (Эти собаки не дерутся. Они играют.)
3. The bus is arriving. (leave)
   The bus isn't arriving. It's leaving. (Автобус не прибывает. Он уезжает.)
4. My uncle is playing football. (watch)
   My uncle isn't playing football. He's watching it. (Мой дядя не играет в футбол. Он смотрит его.)
5. My aunt is doing aerobics. (dance)
   My aunt isn't doing aerobics. She's dancing. (Моя тетя не занимается аэробикой. Она танцует.)
6. I'm playing a game on my phone. (write an email)
   I'm not playing a game on my phone. I'm writing an email. (Я не играю в игру на телефоне. Я пишу электронное письмо.)