Final answer:
The detailed answer provides plural forms of given sentences and singular possessive and plural possessive forms of specific nouns.
Explanation:
Plural Form:
- They are men.
- We are teachers.
- She is your sister. This is his book. (Plural form for 'sister' and 'book' is 'sisters' and 'books' respectively).
Singular Possessive and Plural Possessive Forms:
- Woman: Women, woman's, women's
- Ox: Oxen, ox's, oxen's
- Church: Churches, church's, churches'
- Tomato: Tomatoes, tomato's, tomatoes'
- Piano: Pianos, piano's, pianos'
- Medium: Media, medium's, media's
- Boss: Bosses, boss's, bosses'
- Octopus: Octopuses, octopus's, octopuses'
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