In German the grammar structure is different. They have no equivalent for the question word "do" and in German questions the structure of questions goes like this. Wo wohnst du? Which directly translates to Where lives you? Though Obviously It means Where do you live. In German the subject (In this case "you") almost always gets tacked on the end. The verb goes in the middle. The question word or word that is transformed into the question word goes in the front. So based on this set of rules the Sentence "Magst du die Ente" The verb and question word become one in the same and the subject of the question follows. This form of precise and minimalistic language is really hard to get at first for native English speakers because it's almost impossible to communicate similar ideas with so few words in English. You will get used to it though and even learn to enjoy how concise it is. I know my level at duolingo is lower than yours but just to give you a reason to trust me I'll tell you that I've been studying German for 4 years and only use this website to strengthen grammar and review.