* Verb (past tense): This is the most common usage. It describes an action that happened in the past.
* Example: "He opened the door."
* Adjective (past participle): This is less common but possible in certain contexts, usually when describing something that has been affected by an action.
* Example: "The opened door creaked in the wind."
To determine the part of speech, you need to look at the context of the sentence.