Hi Polaris Sorry, but I find it difficult to explain.I am not an English Language scholar, however I do read, write, and speak perfect English, having had an English Grammar school education In your sentence it is JUST CORRECT to use "RUN" Likewise you would say/write in these correct examples " I almost RAN over a cat this morning" " I was RUN over by a car yesterday " " I missed RUNNING over a dog by inches this morning " " I am RUNNING in the next race, although I RAN two races yesterday, and will RUN another race tomorrow " Sorry I cannot explain it better, but it just comes naturally for a native English speaker to say it correctly.. May be another responder can explain better the grammar involved Regards Ronnie :