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Which preposition are we supposed to use - on or upon.

i.e. "On/upon closing the door, set the alarm on."

apaderno
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user8383
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1 Answers1

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Google NGrams states that on+gerund is still used more often than upon+gerund (tried with hearing below, opening and closing - the diagrams were a bit different, but the overall result was the same).

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Philoto
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