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Discover Ludwig"knows when" is correct and usable in written English.
You can use it when referring to knowing something at a specific point in time. For example: "He knows when the bus will arrive."
Exact(51)
No one knows when.
"He knows when it's showtime".
Who knows when it repeats.
No one knows when housing will recover.
He knows when to rein it in".
A wise politician knows when to leave.
Knows when to hold, knows when to fold.
But someday – who knows when?
It knows when to fade.
Similar(2)
Itaú also knows when to say no.
God alone knows when he will come.
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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