1. As a noun, referring to a man or boy:
* "The fellow in the blue shirt was asking for directions."
* "My fellow classmates and I are going to the library after school."
2. As a noun, referring to a person who shares a common characteristic or interest:
* "He's a fellow artist, and we often share ideas."
* "She's a fellow traveler on this journey of life."
3. As a noun, used to address someone in a friendly or informal way:
* "Hey, fellow, can you spare some change?"
* "Good morning, fellow students!"
4. As an adjective, meaning "of the same kind" or "sharing a common characteristic":
* "We had a fellow feeling of excitement about the trip."
* "The two men were fellow soldiers in the same regiment."
5. As an adjective, used as part of a title or phrase:
* "Fellow traveler"
* "Fellow student"
* "Fellow citizen"
6. As a noun, referring to a member of a professional organization or society:
* "He was elected as a Fellow of the Royal Society."
* "She is a Fellow of the American Academy of Arts and Sciences."
Important note: Using "fellow" can sometimes sound a bit old-fashioned or formal, especially in the sense of referring to a man or boy. It's generally best to use more neutral terms like "man," "boy," or "person" in most cases.