Mấy anh chị giúp em với ạ :( 1)Correct the mistake with narrative tenses in each sentences. 1.He climbed the stairs stealthily and was entering the bedroom. 2.She crossed a field when she spotted a bull grazing by the gate. 3.They couldn't take the flight because they had been forgetting their passports. 4.As a child, I was sitting in the kitchen for hours watching my mother cook. 5.They used to be married in the spring, but war broke out and he was called up. 6.My parents would live in a cottage in the country before they moved to the city centre 7.Our arms were aching as we had shifted boxes all day.We weren't looking forward to continuing the next day,