The singular possessive is author's. The plural possessive is authors'.
The plural possessive form is actors' association (the association of actors)
The performances of the season is the season'sperformances (one season).The performances of the seasons is the seasons'performances (two or more seasons).
theaters
athenian theater, medieval theater, Elizabethan theater, and panoramic theater the difference between the four is their architectural design only
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 echoes. The plural possessive is echoes'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural form is stepsisters. The plural possessive is stepsisters'.
The plural form is inches. The plural possessive is inches'.
The plural possessive of "Father" is, "Fathers"
The plural possessive of bandit is bandits'.
Studies' is the plural possessive of study.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.