* Verb (past participle): This is the most common usage, indicating an action that has been completed.
* Example: "The food was served on time."
* Adjective: This usage describes something that has been served.
* Example: "The served food was delicious."
* Past participle used as an adjective: This is similar to the adjective usage, but with a focus on the action rather than the state.
* Example: "The served dishes were all beautifully presented."
It's important to look at the context of the sentence to determine the specific part of speech.