Where do you put the apostrophe after names that end in S?

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Chris's book. Style manuals now require the 's' except for a few classic names: Jesus', Moses', Socrates'.
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The correct form is Chris's book.

The thing is, when we have classical names and famous foreign names, usually Greek and Roman that refer to people that died a long time ago we use only the apostrophe, as Mrs Geist, my English teacher in middle school would always say.

e.g Pythagoras' Theorem
Jesus' disciples

In all the other cases add 's and you'll be right.

It's Chris's book. For proper names, you add the apostrophe-s to the end. For other nouns, you'd put just an apostrophe at the end, so if you had a bunch of cats and they had beds, you say that those are the cats' beds, or if your parents shared a car, you would say it is your parents' car. However, for names you do put the apostrophe-s.

This is a good question, as this is something that

Proper names have nothing to do with it, as non-native speakers sometimes get wrong. It is a matter of number: singular nouns get the 's, while plural nouns ending in s do not:

Charles's book
The schoolmistress's book

The Charleses' books (the two Charleses, King Charles the First and King Charles the Second)
The schoolmistresses' boo

I always teach the use of an 's' after an apostrophe if the extra 's' is pronounced as a separate syllable. Hence, at primary level, it's relatively easy to learn.

The dogs' bone (several dogs and there's only one 's' pronounced)

but

James's book (we pronounce the second 's' as a new syllable so it is needed to do a job)

In my experience, it's a simple and f

None of the responses to your question are correct. Your question is: Do I add simply an apostrophe to words ending in "s" to indicate a possessive or do I add an apostrophe and an "s" to such words. Here's the answer.

If the word ending in an "s" has a "z" sound, e.g., "Adams," then you should add only an apostrophe, e.g., "That is Mr. Adams' car."

If the word ending in a "s

So if it´s the parents would it be parents´

Right, most of the time.

My parents are tall. Correct.

My parent's parents are tall. Correct: my one parent has tall parents.

My parents' parents are tall. Correct: both of my parents have tall parents.

parents means two parents but does not show "ownership" or a "relationship"

parent's shows "ownership" by one parent

parents' shows "ownersh

Many years ago, I seem to remember my English teacher saying that a monosyllabic name used the apostrophe-s while a polysyllabic one used s-apostrophe

eg. the poems of John Keats = Keats's poems

the poems of Dylan Thomas = Thomas' poems

Or was it another of those occasions when I fell asleep in class?

YES!

When I began scrolling through threply sites, I knew what I was reading was not correct! What a relief to see the correct answer there.

I get crazy over abuses of the apostrophe. It really is terrible to see not only how prevalent this with people who only speak English, but to find the error in adverts, pamphlets, etc.. How can it be that so many people speak only one langu