posted by angie .
estudias? (en mi case.)
An interrogative (question) in Spanish has two question marks. At the beginning, it announces that it is a question before you even read the first word. At the end, it's again clear that it is a question.
¿Estudiás? = do you study? are you studying?
Obviously you would like "in my house" as the answer. Begin with the "yo" form of the verb = I study/do study/am studying in my house. = Estudio en mi casa.