I've learned I can write "thank you for this answer of yours" from this forum. Could you check once again whether there is a wrong one among the following expressions? 1. this book of my friend's 2. my friend's book 3. a book of my friend 4. the book of my friend 5. this book of my friend 6. a book of my friend's I think 3,4,and 5 are wrong expressions. Am I right? Thank you in advance for your teaching.
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