facility plural possessive

Plattdüütsche Grammatik - vun Plattmaster
Good day! I am an English Teacher here in the Philippines. I can't help but ask you questions regarding the rules on possessive nouns. What I have been teaching is

facility plural possessive

Singular and Plural Possessive Nouns

Rules on possessive nouns - Free English.

The apostrophe (’ although often rendered as ') is a punctuation mark, and sometimes a diacritical mark, in languages that use the Latin alphabet or certain other
Associated Press Stylebook

facility plural possessive

Grammer for medical transcription.

plural: Definition from Answers.com.

plural adj. Relating to or composed of more than one member, set, or kind: the plural meanings of a text; a plural society
lower saxon grammar - Plattmasters Grammatik der niederdeutschen (plattdeutschen) Sprache - Teil 1: Zahlwörter, Artikel, Pronomina, Nomen, deutsch-english

A-Z Grammar Worksheets - Plural Nouns - Free printable worksheets that teach English grammar on parts of speech worksheets for grammar practice. Say it! Write it!
Engineering Language/Grammar Skills.
Apostrophe - Wikipedia, the free.

Plural Nouns Common Sense Practice.