A warning reveals a problem but does not repair it
1A science club is testing a small water display. This is an invented learning situation, not a report of a real school experiment. During a supervised check, a warning light draws attention to an irregular movement in one valve. The members had not noticed it before the light appeared. They stop the display and call a technician. The alert has made the fault visible to the team, but it has not repaired the valve.
2One member summarizes the event: "The alert kept the fault from going unnoticed." She means that the warning prevented the problem from escaping their attention. A partner changes unnoticed to noticed because he thinks a positive result should use a positive word. The revision reverses the intended meaning: preventing notice is not the same as preventing a failure to notice. The team restores unnoticed and checks the whole relationship rather than counting negative-looking words.
3A second draft says, "The alert kept the fault from go unnoticed." This time the intended direction is clear, but the form after from is wrong. The team changes go to going. They leave kept as the past-tense verb and do not change going to went. Their final report distinguishes three stages: noticing the fault, requesting help, and repairing the valve. Only the first two have happened when the report is written. The members agree that a sentence should preserve both its grammatical connections and the limits of what the evidence shows. They do not describe the display as fully repaired simply because the warning worked.