* Verb: This is the most common usage. It means to gain knowledge or skill.
* Example: "I learn something new every day."
* Noun: This is less common, but "learn" can be used as a noun meaning "something that is learned" or "a teaching."
* Example: "The professor gave a learn about ancient history."
* Adjective: This is even rarer, but "learn" can sometimes be used as an adjective meaning "learned" or "scholarly."
* Example: "She has a learned look about her." (This usage is outdated and somewhat archaic).
Let me know if you'd like to see some example sentences demonstrating these different uses!