* Adjective: Describes a noun, indicating that something has the quality of life.
* Example: "The dog is alive."
* Adverb: Modifies a verb, adjective, or another adverb, indicating the manner or degree of being alive.
* Example: "The plant is alive and well."
* Noun: Refers to the state of being alive.
* Example: "The doctor confirmed the patient's alive." (This usage is less common, but still possible.)
The specific part of speech depends on its function in the sentence.