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Discover LudwigThe part of the sentence "upon when" is not correct and usable in written English
You can use the phrase "upon which" in written English instead. For example, "She based her argument upon which many agreed."
Exact(59)
Still, he is the actor directors call upon when they need someone to project an awesome emotional volatility and candour.
It was barely commented upon when the report was published.
"Since May all this was agreed upon when they walked through the property," Dr. Lois said.
"It becomes another dimension to draw upon when making decisions or on encountering situations.
He would like to see it drawn upon when it comes to tackling environmental issues.
"It's something you begin to ponder upon when you reach my age.
Now Ringwald is proud to be ruminating upon When It Happens To You.
But it also provides motivation that he will draw upon when the time comes.
Its calories are called upon when glucose is running low – that is, between meals, or during fasts and famines.
He was undefeated and unscored upon when he won the Olympic gold medal in the 1972 Games.
Similar(1)
(Even though I displayed awesome hem-stitching skills with my sit-upon when I was a Brownie).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com