1. It's Alex's book. -- correct 2.
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sb70012Thank you.But why 2 is ok 10 is not?Aren't they similar?"the [noun] of Alex" is not usually natural for possession/ownership of physical objects. It may be possible for more abstract possession, such as "the opinion of Alex", "the life of Alex", "a friend of Alex", etc.
sb70012What about: It's a book of Alex's.Is it incorrect even if I say "Alex's"?That's different. You can say that. I meant that if you say the book of recipes you normally mean the book containing recipes, and so the book of Alex would be a book about Alex. A book of Alex's would mean a book belonging to, or w
sb700121. It's Alex's shirt. == correct2. It's the shirt of Alex.3. It's the shirt of Alex's.I think, 3 is correct and 2 is incorrect. Do you agree with me?I don't find either (2) and (3) natural in normal circumstances. I find "It's a shirt of Alex's" more natural. "It's the shirt of Alex" seems dramatic to me, as if describing some kind of discovery