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I think that you try to translate it litterally you may have to use a different sentence depending on the case.

I would be grateful for, I would be thankfull, it would be so kind of you, please do...

It's a polite and formal way to ask someone to do or not to do something, or to say how grateful you are, or how to say how unplaisant you are about something.

Here's an example for each case:
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