Помогите с английским( задание на времена)Исправьте ошибки1. Are you skating last

Помогите с английским( задание на времена)
Исправьте оплошности
1. Are you skating last Sunday?
2. He had been abroad five years ago
3. When i came home, mother already cooked dinner
4. By eight o'clock yesterday i did my homework and at eight i had been playing the piano
5. When Jane arrived, i was waiting for two hours
6. At this time yesterday i sat at the theatre
7. Mr Davis had smoked for 30 years when he finally gave it up

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