1. He unscrews the lid of the jar to open it.
2. She unscrews the light bulb to replace it with a new one.
3. The mechanic unscrews the bolts to remove the engine cover.
4. He unscrews the cap of the bottle to pour a drink.
5. She unscrews the hinges to take down the old door.
6. The plumber unscrews the pipe fittings to fix a leak.
7. He unscrews the screws to dismantle the furniture.
8. She unscrews the top of the thermos to pour out the hot coffee.
9. The technician unscrews the back panel of the computer to access the internal components.
10. He unscrews the nozzle of the hose to clean it.