When you ask questions using spoken English, you use vocal intonation to indicate what kind of question you are asking. For example, ask this English question "Are you a student?" then your voice will go up at the end. Similarly, ASL signers ask a question using facial expressions, head movements, and pauses that call Non-Manual Signals.
When you ask a yes/no question in ASL, use these non-manual markers that are
raise brows throughout the question
lean your head forward with the last sign
hold the last sign until your listener starts to answer