Hi Oana, thx for your translation. My wife tells me it's maybe not the good meaning. What about moving the "If" at the begining of the sentence, like this : "If I knew from the begining that I would have had to use English in that situation, I would have learnt it better."
You may be right. I would transform the phrase like this: "If I knew from the beginning that I had had to use English in that situation, I would have learnt it better". I think the use of "would" in the first part of the phrase is not grammatically correct. Thank you for your suggestion.