Sure, here are the transformed sentences:

**Sentence transformation 11A:**

7. He couldn't drive this car because he had no driving licence.
- If he had a driving licence, he could drive this car.

8. He found out the key which he lost a long time ago.
- The key which he lost a long time ago was found out by him.

9. Nothing could be done to help him.
- They could do nothing to help him.

10. He was accustomed to stay up late.
- He used to stay up late.

**Sentence transformation 11B:**

1. Someone stole my purse from my handbag.
- My purse was stolen from my handbag.

2. She asked Jone to repeat what he had said.
- "Please repeat what you have said," she asked Jone.

3. It is a pity you didn't tell us about this.
- I wish you had told us about this.

4. We couldn't go out because the weather was so bad.
- It was such bad weather that we couldn't go out.

5. "Keep away from this area" said the security guard when we approached the fence.
- The security guard told us to keep away from this area when we approached the fence.

6. He could repair the broken vase.
- The broken vase could be repaired by him.

7. He is sorry now that he didn't invite us to his party.
- He wishes he had invited us to his party.

8. Although he had a good salary he was unhappy in his job.
- In spite of having a good salary, he was unhappy in his job.

9. He could not afford to buy the car.
- The car was too expensive for him to afford.

10. Couldn't you have got a bus to the station?
- Wasn't there a bus you could have got to the station?

**Sentence transformation 12B:**

1. Jane is a brilliant swimmer. She represented Britain in the Olympic Games.
- Jane, a brilliant swimmer, represented Britain in the Olympic Games.