Hey there, great question! So the V3 (or third form) of a verb is also known as the past participle. In this case, the verb in question is "run".
The V3/past participle form of "run" is "run". Yes, that's right - "run" is one of those tricky verbs that doesn't change form when forming the past participle.
So, to answer your question directly, the V3/past participle of "run" is "run". For example, you could say "I have run a marathon" or "She had run to the store".
Hope that helps! Don't hesitate to ask any more questions about verbs or language in general.
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