Pasar oracion de ingles a plural the clock is on the wall?

Cambiar estas oraciones del singular a el plural : 1 - The picture is an the wall?

1. The pictures are in the wall. 2. The pens are in the desk. 3. Are the lights. 4. Are the umbrallas in the corner 5. Are the apples an / in the tanle? 6. Are the telephone an / in the desk.