A repair team records what it changes
1A repair team worked on old radios for a community display. The visitors needed to know which parts were original and which had been replaced. The team therefore repaired the radios and recorded each change in a log. Its report read, 'Not only did the team repair the radios, but it also recorded every change.' The two actions were both completed; the second was an addition, not a correction of the first.
2Not only the volunteers but also the visitors used the log. A visitor could check whether a switch had been replaced without opening the radio. The log described the work, but it did not claim that every radio would continue working forever. One repaired radio still needed a new case before it could be displayed safely.
3A learner rewrote the report as 'Not only did the team repaired the radios, but also did it recorded every change.' The learner had moved an auxiliary into both clauses and kept the past endings on both main verbs. To revise the sentence, she first separated the two actions from the two groups of people. She then checked the position of each auxiliary and the form of the verb following it. Keeping the meaning and the structure together prevented the repair work from disappearing during the correction.