Answer: In the sentence provided, the participle is <u>"digging"</u> and the word that it is modifying is <u>"man"</u>.
Explanation: A participle is a non-finite verb form. There are two types of participles: past participles and present participles. While past participles end in "-en", "-ed", "-t", "-d" or "-n",<u> present participles end in "-ing"</u>. Moreover, present participles usually act as adjectives and modify nouns. In the sentence "The man digging in the quarry helped us find our baseball",<u> "digging" is a present participle because, besides ending in "-ing", it is functioning as an adjective and it is modifying the noun that is immediately before it: "man"</u>.