I saw a this title of a video on YouTube: 'Folded man' stands up straight after 28 years following surgery that broke bone.
I wanna ask that the word "following" in here, why it is "following" but not "follow". What makes it becomes V-ing
com/dictionary/american/following_1
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"Following" is a preposition meaning "after."
In this sentence, it is not used as the present participle of the verb "follow."
https://www.macmillandictionary.com/dictionary/american/following_1