Use an apostrophe to indicate possession with nouns. A plural noun that does end in “s” forms the possessive adding just ‘. Write the noun; change no letters; drop no letters; and then simply add ‘. This rule is always the same for each plural noun that does end in “s.”
(To be sure you need a possessive and not just a plural, say the word followed by “what.” Example: I saw those girls. “Girls” what? Nothing. “Girls” is a plural. I saw those girls’ gloves. “Girls” what? “Gloves” so “girls” is a possessive.)
Instructions: Supply the apostrophes to make the possessives in the following sentences.
1. All the pupils seats were taken.
2. Mud had covered all of the girls dresses.
3. The lawyers fees came to a million dollars.
4. The Allens house burned to the ground last night.
5. The sailors parents were very worried by the news.
–For answers scroll down.
1. All the pupils’ seats were taken.
2. Mud had covered all of the girls’ dresses.
3. The lawyers’ fees came to a million dollars.
4. The Allens’ house burned to the ground last night.
5. The sailors’ parents were very worried by the news.
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from Daily Grammar Lessons Blog http://dailygrammarlessons.blogspot.com/2018/04/lesson-403-mechanics-punctuation.html