Hello....
John bought a book for Mary.
Can the above mean all three meanings below?
Not quite. pructus John bought a book and gave it to Mary. John bought a book , and gave it to Mary.
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Not quite.
pructusJohn bought a book and gave it to Mary.
John bought a book, and gave it to Mary.
This would mean, John bought a book, not particularly for Mary, but eventually chose to give that to her. He could have kept that for himself, or could have given that to someone else as well.
pructusJohn bought
I will rephrase the sentences, to make them clearer.
John bought the book for Mary.