To determine the part of speech, we need a complete phrase or sentence.
Here are some examples:
* "It is going." In this sentence, "going" is a present participle acting as a verb.
* "It's going to rain." Here, "going" is part of the phrasal verb "going to," which acts as a future tense marker.
* "I saw it going down the street." Here, "going" is a present participle acting as an adjective modifying "it."
Please provide more context so I can accurately identify the part of speech.