I can't think of a situation in which I would use "knocking at".
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Wendy Zhang"knocking at" and "knocking on"at focuses on the location of the person knocking. on focuses on the object being struck. It would be absurd to use both, but theoretically you could.
AnonymousU can use both if ur describing a knock.4 example"Theres a knock at the door"or"Someones knocking on the door."It depends on how U want 2 structure ur sentence.The key is the prepositions "on" & "at".The more correct way would be 2 use"on" as the knock is on the surface of something.But "at" could be used if U changed the sentence 2 describe the place the knock i
dimsumexpressKnocking on the door - is commom as well. But not knocking by the door". "knoocking by the door" does not mean 'knocking on the door'.
To me, the problem seems to be that "knocking at the door" has two meanings; one is physicaly hitting the door and the ot
canadian45I don't know why anyone would say 'knocking at the door' to mean 'knocking on the door'.They say it because that's the way they've heard others say it. But besides that, the idea is that someone is standing at the door, knocking.
canadian45You slap me on the wrist, not at the wrist.True, but if