He took the steps two at a time and knocked lightly on the front door.

At last she raised her hand and knocked lightly on the door.

At dinner time, he took a break and knocked lightly on Ariel?

Captain Smith knocked lightly on the door, then stuck his head inside.

When the song ended, he knocked lightly on the door.

It took only a few moments before he knocked lightly on the door.

I knocked lightly on the glass door to get his attention.

I went along to her room and knocked lightly on the door.

His guide knocked lightly, then stood aside and opened the door.

He knocked lightly at the door, and it opened immediately.