Both are grammatically correct; the meaning differs slightly.
"When he was running, I noticed him limp," conveys the idea that during an activity that is now over something happened., as in "he may not be limping now, but when he was running, I saw him limp."
"When he ran, I noticed him limp," conveys the idea that (perhaps) he ran several times, limping each time.
past: ran past perfect: had run past progressive: was/were running past perfect progressive: had been running
Ran
Ran out of gas? Or ran out of oil?
No, the correct past tense form of "run" in this case is "was ran" or "were running."
slowly or fast, or quickly, or pantingly, or stumblingly
Ran is the past tense of run. Running is the present participle.
The athletes were running.
The word 'ran' is the past tense of the verb to run (runs, running, ran). The noun forms are:runrunsrunnerrunningrunwayrunoffrunner-uprunaboutrundownrunaway
The verb in this statement is the word "ran".This is because the word "ran" is an action.Other similar verbs are run, running and runs.
The past tense of "run" is "ran", and the present tense is "run".
Running doesn't have a past participle. Running is the present participle of run. Ran is the past participle of run
Romney's running mate was Paul Ryan.