* Present participle: This is the most common use, and it's used to form the continuous tenses (e.g., "I am walking," "She was sleeping").
* Gerund: This is a verb form that acts like a noun (e.g., "Swimming is my favorite hobby," "He enjoys reading").
* Adjective: Sometimes, a verb ending in "-ing" acts as an adjective describing a noun (e.g., "It's a frightening movie," "The running water is refreshing").
Therefore, just because a verb form ends in "-ing," it doesn't automatically mean it's a present tense. You need to consider the context of the sentence to determine its function.