To ask IF HE IS YOUR TEACHER, we say: "Is (a)   ?"

To ask THE PLACE WE ARE GOING, we say: "Where (a)   ?"

To ask IF THE RESTAURANTS ARE OPEN, we say: "Are (a)   ?"

To ask WHEN THE CLASS IS OVER, we say: "When (a)   ?"

To ask IF SHOPS OPEN ON FRIDAYS, we say: "Do (a)   ?"

To ask WHERE RIO DE JANEIRO IS, we say: "Where (a)   ?"

To ask IF THE SUPERMARKET ACCEPT DOLLARS, we say: "Does the (a)   ?"