1.   He thought the door was locked, but he turned the knob and the door opened.

2.   He turned the knob and pushed against the door.

3.   Amazed, the doctor turned the knob again and increased the pain threshold to fifty percent.

4.   As he turned the knob, shots rang out.

5.   A tiny blue light comes on when you turn the air-conditioner knob.

6.   All the knobs were turned up full blast.

7.   Doorknob covers can make them difficult for a child to grip and turn the knob.

8.   I kept turning the knob, dumbly hoping something substantive would happen.

9.   I turned knobs and kicked and railed, to no avail.

10.   Inside, the driver presses a button or turns a knob, and the engine starts.