* Singular, male: The university held a reunion for its alumni, including a renowned alumnus who had become a successful entrepreneur.
* Singular, female: The school was proud to honor its alumna who had won a prestigious award for her research.
* Plural, mixed gender: Many alumni returned to campus for the annual fundraising gala.
* Plural, male: The alumni of the fraternity gathered for their yearly reunion.
* Plural, female: The alumnae of the sorority organized a volunteer project in the local community.
Note: "Alumnus" is the singular masculine form, "alumna" is the singular feminine form, and "alumni" is the plural form for both genders. While "alumnae" is the plural feminine form, it is often used interchangeably with "alumni" for mixed gender groups.