The singular possessive is athlete's. The plural possessive is athletes'.
"Athlete's" would be the possessive form of one athlete. "Athletes'" would be the possessive form of two or more athletes.
The noun athletics is an uncountable noun that has no singular form.The word athletic is an adjective, a word that describes a noun.The possessive form of the plural, uncountable noun is athletics'.example: The athletics' curriculum at this school is nonexistent.
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is relatives. The plural possessive is relatives'.
The plural is lads. The plural possessive is lads'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural form is echoes. The plural possessive is echoes'.
The plural form is inches. The plural possessive is inches'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural possessive of stepsister is stepsisters'.
The plural possessive of desert is deserts'.