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Discover LudwigThe phrase "have testified to" is correct and usable in written English.
It can be used when referring to someone providing evidence or a statement, typically in a legal or formal context.
Example: "Several witnesses have testified to the events that took place on the night of the incident."
Alternatives: "have given evidence about" or "have attested to".
Exact(59)
Both have testified to the grand jury.
Some foreclosures include documents from people who have testified to being robo-signers in other courts.
A number of associates have testified to his obsession with profits.
For Mr. Eisenman, graffiti would simply have testified to the memorial's impact.
For centuries, people across the globe have testified to the relaxing and invigorating qualities of tea.
Those who knew her in office have testified to her common decency.
Irvine Welsh, Ali Smith, Iain Banks and AL Kennedy are among those who have testified to its influence.
Pellegrin's name appears again in the list of photographers who have testified to the long struggle of the Palestinians.
He was the only witness who might have testified to petitioner's possible lack of knowledge of the contents of the package that he 'transported'... to John Doe's car.
'Now, you can't guess as to what Mr. Anderson would or would not have testified to if he did get on the stand, because you haven't heard it.
Similar(1)
So to suggest this is in any way anti-Semitic, when many, many Jews, including a rabbi from Omaha, [have] testified to [his] good relationship with [the] Jewish community... is character assassination, to be honest".
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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