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Discover LudwigThe phrase "a certificate testifying" is correct and usable in written English.
It can be used when referring to a document that serves as proof or evidence of something, often in formal or legal contexts.
Example: "The university issued a certificate testifying to her completion of the degree program."
Alternatives: "a certificate confirming" or "a certificate verifying".
Exact(1)
On her kitchen wall, Ms. Hendrickson has hung a certificate testifying to her completion of a job-readiness program that states have urged welfare recipients to take as they move off the rolls.
Similar(59)
Inside her sari she had tucked a precious piece of paper – her grandson's birth certificate, testifying that he is 16 and a minor, which could help him get a lighter sentence if he is convicted.
When autumn came and my term was over, I received three certificates testifying that I had passed three courses.
The film received an "A" certificate.
Alongside that, though, said Reif, many universities will offer online courses to students anywhere in the world, in which they will earn "credentials" — certificates that testify that they have done the work and passed all the exams.
I got a certificate.
Or only a certificate?
A cup? A certificate?
Do you earn a certificate?
"No need for a certificate".
She left without a certificate.
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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