what are you studying ?
can you translate that into spanish please?????
¿Que estás estudiando?
¿Qué estudias [tú]?
(present tense, indicative) can also be used if you are not emphasizing what the person is doing at that very moment in time (present continuous=estar+gerundio)
What are you studying [this semester]?
¿Qué estás estudiando?-familiar ¿Qué está usted estudiando?-polite