It said I was wrong for putting "su" instead of "tu" but I am right. "Su" is the 'Ud' form of "your" & is totally acceptable. It is just more formal & respectful than using "tu". This major flaw needs some administrative review.
Hm...that seems like it'd be right (I've only see someone include tú and place it after a verb in a question once before because people I've been around always dropped the pronoun, so maybe having tú there isn't so common, but I think it ought to be right.
To use tu for the possessive pronoun, you need to use quieres, not quiere, which implies tú as the subject of the sentence. Quiere implies usted as a subject, which would require su as a possessive pronoun.
Hey! So I had a problem where it gave me this question twice in a row, BUT the first time I answered it I put quieres, and it counted it wrong. But then when I put the word it said was correct (desea) it said it was still wrong. Does anybody know why?