Question

who is knocking the door
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Answer 1

Answer:

The phrase "knock on the door" usually uses "knock" as a verb. Knocking on a door is using the knuckles of the hand to hit a door to get the attention of someone on the other side of the door. The phrase "knock at the door" uses "knock" as a noun

Explanation:

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Answer 2

A waiter was knocking at the door with a tray, a bottle and two glasses. He had come to serve the drink that they ordered when they had returned. He left the room after he had set the table.

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