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Discover LudwigThe phrase "knew at once" is grammatically correct and can be used in written English.
It is typically used to convey that someone instantly realized or understood something. Example: As soon as I saw the broken window, I knew at once that there had been a break-in.
Exact(59)
Twenty-seven years later she said of me, on stage at the Harrogate crime writing festival, that she knew "at once" that I "was absolutely trustworthy, honourable and honest".
She knew at once.
She knew at once how much he had paid.
Hamilton knew at once that the wound was mortal.
I knew at once I was going to marry her.
I knew at once that it was a lynching.
I knew at once it was time to move.
[Ephraim Goldfain, a physician,] knew at once that this was no contagion.
But Mr. Marai knew at once that Mr. Hossaini's picture was special.
I knew at once that something had changed during my absence.
"And I knew at once that it was what I wanted to do".
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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