Sure, here are the completed sentences:

7. Because Faraday's father was very poor, he couldn't send Faraday to school.
Faraday's father was too poor to send him to school.

8. It is such a boring book that nobody likes it.
The book is so boring that nobody likes it.

9. They were so strong that they could lift the rock.
They were such strong people that they could lift the rock.

10. I can't play tennis as well as my brother does.
My brother plays tennis better than I do.

Sentence transformation 19B:

1. The ship was not surrendered until it was half burnt.
The ship was half burnt before it was surrendered.

2. The weather forecast was inaccurate, so we didn’t take the right precaution.
Had the weather forecast been accurate, we would have taken the right precaution.

3. The temperature didn’t fall below zero last night, so the crops weren’t damaged.
If the temperature had fallen below zero last night, the crops would have been damaged.

4. Though I am poor, I’ll not serve a villain.
Poor as I am, I’ll not serve a villain.

5. Although I pay him much, this man’s never satisfied.
However much I pay him, this man’s never satisfied.

6. These mangoes are so cheap that they cannot be good.
Since these mangoes are so cheap, they cannot be good.

7. You must speak slowly or he’ll not be able to understand you.
Unless you speak slowly, he’ll not be able to understand you.

8. John always spoke to his lawyer before signing the contract.
John didn’t sign the contract without speaking to his lawyer.

9. Jane is the tallest girl in her class.
Nobody in Jane’s class is taller than her.

10. My suit needs cleaning before I go to the party.
I need to have my suit cleaned before I go to the party.