I have to write these sentence with the same meaning. Can anybody look them up, please?

1. We will refund your booking fee, provided you cancel 48 hours in advance.
-> We will only refund your booking fee, if you cancel 48 hours in advance.

2. I wish you told me about the cheao flights to Italy.
-> If you only told me about the cheao flights to Italy.

3. Thanks to the skill of the surgeon, the child survived.
-> If it hadn't been a good skilled surgeon the child doesn't survive.

4. Let us know if you have second thoughts.
-> If you should have second thoughts let us know.

5. If you hadn't helped me, I would have made a complete mess of this.
-> But for the help you gave me, I would have made a complete mess of this.

6. Please come this way, sir. Could I take your coat?
-> Please come this way, sir. If I might could take your coat?

7. You can offer me more money, but I still won't sell the house to you!
-> Even if you offer me more money, I won't sell the house to you!

8. I you let me get a word in edgeways, I'll tell you what I discovered.
-> Let me tell a word in edgeways and I tell you, what U discovered.

9. If you changed your mind about the job, we'd be interested in hearing from you.
-> If you were changing your mind about the job, we were interested in hearing from you.

10. As long as there are no delays, we'll be there by six.
-> Unless there arn't delays we are there at six.

I'm german, so there are maybe a lot of mistakes.. but I do my best ;)
The first sentence was in the book, and the sentence marked with -> is my creation... If there are a better solutions please tell me :)

3 answers

1. We will refund your booking fee, provided you cancel 48 hours in advance.
-> We will only refund your booking fee if you cancel 48 hours in advance.

2. I wish you told me about the cheap flights to Italy.
-> If you only told me about the cheap flights to Italy. [This is not a grammatically complete sentence, but it echoes the meaning of the sentence you were given.]

3. Thanks to the skill of the surgeon, the child survived.
-> If there hadn't been a highly skilled surgeon, the child wouldn’t have survived.

4. Let us know if you have second thoughts.
-> If you should have second thoughts, let us know.

5. If you hadn't helped me, I would have made a complete mess of this.
-> But for the help you gave me, I would have made a complete mess of this.

6. Please come this way, sir. Could I take your coat?
-> Please come this way, sir. May I take your coat?

7. You can offer me more money, but I still won't sell the house to you!
-> Even if you offer me more money, I won't sell the house to you!

8. I you let me get a word in edgeways, I'll tell you what I discovered.
-> Let me tell a word in edgeways, and I tell you what I discovered.

9. If you changed your mind about the job, we'd be interested in hearing from you.
-> If you were change your mind about the job, we will be interested in hearing from you.

10. As long as there are no delays, we'll be there by six.
-> We will be there at six if there are no delays.
thank you very much :)
You're welcome!