If you're going to buy a car, I'll lend you some of the money. This is correct and complete. "you are" is not wrong, but I changed it " to "you're" because it seems a conversational sentence, and also to match the contraction of "I'll".
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kunsusukiDon't we need to add some information about the money?There is no word "informations" in English. "Lending" is already about money. I don't think you need to add anything more unless you want to, for example, if you want to specify the exact amount you're willing to lend.