Ran or run

Question

I should have not run after eating.I should have not ran after eating.Which is correct?  Why?

Cool Breeze · Accepted Answer

Neither sentence is correct. Not is in the wrong place. I should not have run is right. Should is a defective auxiliary and thus an infinitive must be used after it. There are two infinitives in the active voice and another two in the passive. They are called (at least in this part of the world) the present infinitive and the perfect infinitive. The perfect infinitive usually refers to the past, to things that have already accurred.

It is formed by adding a past participle after have:
have seen, have gone, have needed, have run

The past participle of run is run, not ran, which is the past tense: He ran away.

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Ran or run

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