Sure, here are the transformed sentences:

**Sentence transformation 9B**

1. I would do anything for you.
- There's nothing I wouldn't do for you.

2. Yogurt is supposed to be good for you.
- Yogurt is supposed to do you good.

3. Is it essential to meet your aunt at the station?
- Does your aunt have to be met at the station?

4. Even though I admire his courage, I think he is foolish.
- Much as I admire his courage, I think he is foolish.

5. Given fair warning, I could have avoided that date.
- If you had told me in advance, I could have avoided that date.

6. Please don't say things like that.
- I wish you wouldn't say things like that.

7. It would have been a superb weekend if it hadn't been for the weather.
- But for the weather, it would have been a superb weekend.

8. Dogs can swim better than cats can.
- Cats cannot swim as well as dogs can.

9. She hasn't been to the hairdresser for three months.
- It's been three months since she went to the hairdresser.

10. There's a spare bed in David's room.
- David's room has a spare bed.

**Sentence transformation 10B**

1. I can't get my feet into these shoes.
- These shoes are too small for my feet.

2. I am very pleased that we shall meet again soon.
- I'm looking forward to meeting you again soon.

3. 'Keep away from this area', said the security guard, when we approached the fence.
- The security guard told us to keep away from that area when we approached the fence.

4. I've never met such a famous person before.
- It's the first time I've met such a famous person.

5. This pudding can be cooked in its tin.
- You don't need to take this pudding out of its tin to cook it.

6. They thought that he was waiting for a message.
- He was thought to be waiting for a message.