* Verb: When "running" describes an action, it's a verb.
* Example: "I am running a marathon."
* Gerund: When "running" functions as a noun, it's a gerund.
* Example: "Running is my favorite way to exercise."
* Present Participle: When "running" modifies a noun or pronoun, it's a present participle.
* Example: "The running water was refreshing."
To determine the part of speech for "running" in a specific sentence, consider its role and function within the sentence.