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Could you tell me please, if is it correct to say?

1.- When you’re playing the piano, I feel very fortunate.

2.- When I go to Germany, I’ll visit you.

3.- If sometime you visit London, I’ll show you the Tower.

4.- If she has not been able to do this simple work, how can she be applying for that job?

5.- If you have visited her, then you have been able to verify my point of view.

6.- If Gregory has made what has made, he will have to pay for it very expensively.

7.- If I was doing that way, it was to improve our work.

8.- If I made it this way and you liked it, I will try in the future to make it even better.

9.- If I made it this way and you liked it, I will still try in the future to make it better.

10.- I was wondering if you could share this with me.

11.- I was wondering if you would be able to do it.

12.- I wondered if you would be so kind as to send me q book of yours.

13.- If you had visited her, you might have been able to verify what I said.

14.- I would rather (would sooner) he tell her than I do.

15.- I would rather (would sooner) he told her than I did.

16.- I would rather (would sooner) he had told her than I had done.

17.- I’m ready when you are.

18.- I’ll be ready when you are.

19.- I’ll do it when you be ready. Or is it better: I’ll do it when you are ready.

20.- We’ll go, when you are ready.

Thank you in advance,

Eladio
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These have problems, Eladio:

#6, 7, 12, 14-16 (I would eliminate the verb 'do'), 19 (choose the second), 20.
Comments  
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Thank you Mister Micawber. What about if I write:

6.- If Gregory has made this, he will have to pay for it.

7.- If I was doing that, it was to improve our work.

14.- I would rather (would sooner) he tell her than I would.

15.- I would rather (would sooner) he told her than I would.

16.- I would rather (would sooner) he had told her than I would.

20.- We’ll go, when you be ready.

You said nothing about which one is better:

19.- I’ll do it when you be ready. Or is it better: I’ll do it when you are ready.

Could you comment this point, please.

6 and 7 are fixed.

14-16: I'm not sure why, but the second verb does not work. I expected:

14.- I would rather (would sooner) he tell her than I .
15.- I would rather (would sooner) he told her than I.
16.- I would rather (would sooner) he had told her than I.

The verb to follow could only be 'tell her': I would rather he tell her than I (tell her).

19-20:
(X) We’ll go, when you be ready. -- not right at all; no call for the subjunctive. I expected it simply without the comma: We’ll go when you are ready.