The phrase "a single instance when the" is correct and usable in written English.
It can be used to refer to one specific occurrence or example of something happening in a particular context.
Example: "There was a single instance when the team successfully completed the project ahead of schedule."
Alternatives: "one occasion when the" or "a specific case when the".
I am generally suspicious of this tradition for the simple reason that I cannot think of a single instance when this tradition has ever actually prevented a war.
"I don't think anyone can point to a single instance when News Corporation has benefited at the expense of BSkyB shareholders".
I can't recall a single instance when there was no valid reason for the confrontation (from what I observed, this was often due to the perceived lack of intellectual rigor) however the force of the outburst was rarely in line with the actual issue at hand.
Flanked by attorneys, Nazarian told the board that his recent drug use was "a bad indiscretion" and "a mistake" but insisted the episode was isolated to a single instance when he was attending a golf tournament in Mexico.
So much of my time in school was spent studying the works of others, but I can't recall a single instance when someone stood in front of a class and lectured about a "personal brand". While studying the works and achievements of others was helpful, in hindsight, I wish we had a greater focus on personal brand and development.
"He's a natural reconciler," Cuomo said, adding that he couldn't recall a single instance when Rubenstein pressed his own views.
I cannot think of a single instance when someone has said "No, I don't". Who can blame them: Innovative cultures are generally depicted as pretty fun.
Steny Hoyer, the outgoing House majority leader, noted Thursday that he couldn't remember a single instance when Democrats did not change their schedule to accommodate a request to meet with President George W. Bush.
