Here's how to tell which one it is:
* Past participle: It's part of a compound tense. It needs an auxiliary verb (avoir or être) to form a complete verb phrase. Examples:
* J'ai fait mes devoirs. (I did my homework)
* Elle a fait un gâteau. (She made a cake)
* Present tense: It's the verb by itself, describing an action happening now. Example:
* Il fait beau aujourd'hui. (It's beautiful today)
So, "fait" is not just past tense, but can also be present tense. You need to look at the context of the sentence to understand its function.