The plural form of the noun theory is theories.
The plural possessive form is theories'.
example: All of his theories' validity is questionable.
The plural form of the noun teacher is teachers.The plural possessive form is teachers'.Example: We have a new coffee maker in the teachers'lounge.
The possessive form for the noun theory is theory's.Example: The theory's basis is founded on scientific principles.
The plural possessive of "child teacher" is "child teachers'".
The noun 'curriculum' has two accepted plural forms, curricula and curriculums.The plural possessive forms are curricula's and curriculums'.
The possessive form of the singular noun teacher is teacher's.Example: I put your note on the teacher's desk.The plural form of the noun teacher is teachers.The plural possessive form is teachers'.Example: The teachers' meeting is scheduled for three.
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'.