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Aren't they both correct?

Max's house or Max' house

My teacher told me that the only correct answer is 'Max's house'. But i think they are both correct.

Is he wrong?

P.S. By the way, I didn't mean to accuse him. I just want an answer! :]

Thank you.

~w
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Even natives don't agree on this.

I would write Max's house every single time and I would say it as "Max-iz."
I also write things like James's car.
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AnonymousMy teacher told me that the only correct answer is 'Max's house'. But i think they are both correct.

Is he wrong?
While Max' house may be technically correct according to a style manual or two that you might be able to find, it seems exceedingly odd to my ear. As it turns out I have a friend named Max, and I would never say I was going to Max' house, but only to Max's house. That's especially important to me because I have another friend named Mac. I don't want my other friends to think I'm talking about Mac's house when I'm talking about Max's house. Emotion: smile

CJ
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By 'THIS', you mean, the only correct answer is 'Max's house', right?

Please write back!
 CalifJim's reply was promoted to an answer.
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As I said, native speakers don't agree on what's "correct." As Jim said, you may be able to find a style guide or two that says that Max' is okay.

Neither Jim nor I would say it or write it that way.
Thank you, thank you!

One more question. What about 'kids'?

Is it 'the kids's room'?
The word "kids" is a standard plural word, so the possessive apostrophe goes after the s.

One kid: It's my kid's room.

Two kids: It's the kids' room.

It's the singular words that end in an s, x, ch, or sh (in letters or in sound) that create this disagreement.
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Max's seems right...with it being pronounced Maxiz...the 's is sometimes avoided with a name ending with the letter s (eg in James and James's) to avoid too many essiz in writing...I don't think that is done with a name ending with the letter X...
I thought that anything ending with an x, would add ES?