The phrase "acknowledged that certain" is correct and usable in written English.
You can use it when discussing recognition or acceptance of specific facts or situations.
Example: "The committee acknowledged that certain issues needed to be addressed before moving forward with the project."
Alternatives: "recognized that specific" or "admitted that particular".
He acknowledged that certain attitudes have to be extirpated.
At Kennedy, officials acknowledged that certain weather conditions could worsen any problems.
Both companies have acknowledged that certain investors were allowed to trade rapidly in and out of their funds.
But he acknowledged that certain products, like moisturizers that can even out skin tone or reduce shine on the face, have been growing in popularity.
Ms. Kron was as funny and articulate as ever, but she acknowledged that certain subjects are beyond the reach of words.
But she acknowledged that certain children needed to be nudged into books by allowing them to read popular titles like the "Twilight" series by Stephenie Meyer.
While acknowledging that certain points raised by the antiwar activists were valid, some professors sounded a note of caution.
That letter, Mr. Weissglas said, was a result of his earlier negotiations with Bush administration officials acknowledging that certain settlement blocks would remain Israeli and open to continued growth.
"A lot of people say, Kick them out, let them get their G.E.D.'s or go to the alternative high school," Lynn McBride, board president, said, acknowledging that certain children have caused great difficulty.
Solving law's broader culture and sexual misconduct problems requires acknowledging that certain groups of lawyers are especially vulnerable, and it's clear now that protective measures for young lawyers in particular are sorely overdue.
Dr. Daily acknowledges that certain properties of nature defy quantification.
