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The phrase "determined for certain" is grammatically correct and can be used in written English
It means something has been decided or settled with confidence. Example: After conducting thorough research, the scientist was able to determine for certain that the new vaccine was effective in preventing the virus.
Exact(8)
He said that had not been determined for certain.
While the purpose of the activity cannot be determined for certain, analysts say similar dredging work has been the precursor to more extensive construction on other reefs.
While some studies find correlations between overall media exposure and problems with attention and language, no one has determined for certain which comes first.
"We have not determined for certain that it was an attack by Anonymous, but we have received reports that they claimed responsibility," he said, according to the New York Times.
"We have not determined for certain that it was an attack by Anonymous, but we have received reports that they claimed responsibility," Suga said.
Moreover, the contribution of PAI-related genes to the pathogenicity of E. faecalis has been experimentally determined for certain traits, such as araC, cytolysin, esp [5], [100], [105].
Similar(52)
How very marvelous to imagine that in our lifetimes we might determine, for certain, whether the universe would end with a bang or a whimper.
WASHINGTON — Even the most exacting truth commission may have a hard time determining for certain whether brutal interrogations conducted by the Central Intelligence Agency helped keep the country safe.
It is extraordinarily difficult to trace the source of any sophisticated computer worm, and nearly impossible to determine for certain its target.
Officials from Buy.com, an online retailer, and the popular auction site eBay.com said they could not determine for certain whether all the attacks were related or were by the same person or persons.
When the flow of revenue and/or financing is impossible to determine for certain, this reduces the use of evaluative methods based these elements.
More suggestions(21)
determine for certain
demonstrated for certain
designated for certain
detected for certain
examined for certain
predicted for certain
investigated for certain
ascertained for certain
decided for certain
identified for certain
administered for certain
established for certain
confirmed for certain
destined for certain
discovered for certain
inferred for certain
determined for sure
determined for 60Co
determined for mobile
determined for multiple
validated for certain
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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