1.When we came, the roof of the house was being repaired (by them).

3.Her new T-shirt was being worn (by her) when I met her yesterday.

4. A letter was being written by Ann.

5. All the workers of the plan were being instructed by the chief engineer.

       GOOD LUCK !

1. When we came, they were repairing the roof of the house.

-> When we came, the roof was being repaired of the house.

Cấu trúc câu bị động quá khứ đơn: S + was/were + BEING + Vpp/ed + O

3. She was wearing her new T-shirt when I met her yesterday.

-> Her new T-shirt was being written when I met her yesterday.

4. Ann was writing a letter.

-> A letter was being written by Ann

5. The chief engineer was instructing all the workers on the plan.

-> All the workers were being instructed on the plan by the chief engineer