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I know this has been asked. I understand that ran is past and run is perfect past tense. However, I am still somewhat confused on what is correct in this case:

This report section contains data for 25 units ran at X and Y conditions

or

This report section contains data for 25 units run at X and Y conditions

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The first is wrong, the second right. I don't know enough grammar to tell you just why.

The "at X and Y conditions" is awkward. I might say "under conditions X and Y".

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  • Agree for sure. Something to do w the phrase being a modifier of “units”
    – Al Brown
    Commented Sep 3, 2021 at 2:12
  • Also “conditions X and Y” is better
    – Al Brown
    Commented Sep 3, 2021 at 2:13
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The second one is correct - it implies which were run.

It would be possible to say which I/we ran, but this would be less appropriate in a technical report.

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