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Discover LudwigIt is grammatically correct and can be used in written English.
It is typically used to express uncertainty or inability to determine something. Example: The cause of the fire could not be determined by the investigators.
Exact(59)
The death toll could not be determined.
Its fate could not be determined.
His whereabouts could not be determined.
Mr. Fawcett's concerns could not be determined.
The gender of one body could not be determined.
The names of the lawmakers could not be determined.
The identity of that driver could not be determined.
Two more died of causes that could not be determined.
Whether he was sincere or ironic could not be determined.
The exact size of the investment could not be determined.
What set off the violence could not be determined.
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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