The phrase "a certain sentence" is correct and usable in written English.
It can be used when referring to a specific sentence that is not explicitly identified or when the speaker wants to emphasize the particularity of that sentence.
Example: "In the context of our discussion, a certain sentence stood out to me as particularly insightful."
Alternatives: "a specific sentence" or "one particular sentence".
To determine whether a certain sentence is true, one must be able to understand the sentence, to know what it means.
It's common for an interrogator to tell a political prisoner to expect a certain sentence and then for the judge to issue precisely that sentence.
"So if we come across a document for translation with similar wording in the future, we can use parts or even the whole translation of a certain sentence again.
The judge, who had a mimeo copy of the argument, interrupted to advise the attorney that if he used a certain sentence in the final paragraph, it would do him no good and the judge would have to comment on the sentence which would not be pleasant for either party.
The order in which the samples of a certain sentence were shown was randomized.
I do not mean by my utterance that I am uttering a certain sentence.
According to Rousseau's own account, Thérèse bore him five children, all of whom were deposited at the foundling hospital shortly after birth, an almost certain sentence of death in eighteenth-century France.
Madoff, who pleaded guilty Thursday to running an elaborate, vast and long-running Ponzi scheme, will receive his sentence in June and faces up to 150 years behind bars, a certain life sentence for a 70-year-old.
We have simply extended these procedures to certain sentencing cases.
We asked all the children if a certain illogical sentence was grammatically correct: "Apples grow on noses".
Quine famously responded to this problem by writing: "We may treat a mouse's fear of a cat as his fearing true a certain English sentence.
