In asl we often use facial expression in addicting to hand signs in order to. Invest meaning this is especially true when asking question how do you distinguish between asking yes /no question and a wh- question (who what where when why)

The sentence structure and order in which you sign each word varies between yes/no questions and wh- questions

The orientation of the hands differs when asking yes/no questions versus wh- questions

What you do with your eyebrows an how your head is tilted is different when asking yes/no question than when asking wh- questions

Where on the body you indicate the sign for question mark differs for yes/no questions and wh- questions