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What is the mistake? As for the wonderful offer you have done me regarding the letters of reference , I´m very grateful to you. (I don't know which offer is better: the Letter or have the oportunitv to visit Düsseldorf and Cologne ) . No doubt about it, if I won the scholarship ( I have a lot of faith on it ) and stay in Aachen, I will accept a day in Düsseldorf  .According to your correction : I "think" is better that form : With respect to the wonderful offer you have made me about the letters of reference, I´m very very grateful to you. (I don't know which offer is better: the Letter or having the oportunitv to visit Düsseldorf and Cologne ). No doubt about it, if I win the scholarship ( I have a lot of faith that I will ) and go to Aachen, I'll let you know. :)* this form

Answers · 13

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I am not sure exactly what you are trying to say, but I will try to edit your sentences. As for the wonderful offer you have done FOR me regarding the letters of reference , I´m very grateful to you. No doubt about it, if I WIN the scholarship (I have a lot of faith THAT I WILL) and stay in Aachen, I will accept a day ["day" does not make sense here, I am not sure what you mean] in Düsseldorf. 
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"As for the wonderful offer you have made me regarding the letters of reference , I´m very grateful to you. (I don't know which offer is better: the Letter or having the oportunity to visit Düsseldorf and Cologne ) . No doubt about it, if I win the scholarship ( I have a lot of faith in it ) and stay in Aachen, I will accept a day in Düsseldorf  ."
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...and if I win (not won)
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Where are the mistakes? I’m very grateful to you for the wonderful offer you have made me. Regarding the letters of reference, I don't know which offer is better; the Letter, or having the opportunity to visit Düsseldorf and Cologne. Do not doubt that if I win the scholarship (which I have a lot of faith that I will), and get to stay in Aachen, I will accept your invitation and spend a day in Düsseldorf  .
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I suggest posting texts/emails in Notebook ( http://www.italki.com/notebook ). You can also explain yourself more. There are a number of mistakes in your text, and the Answers section isn't very good for correcting texts. The first glaring error is that you "make (someone) an offer", but you "do (someone) a favour". "The wonderful offer you have done me" is quite wrong and awkward-sounding.

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