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1) For my part , I prefer living in the country.

2) On my part , I prefer living in the country.

3) From my part, I prefer living in th country.

Which one is gramatically correct? and what are the differences among them?

Thanks
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To me,

#1 is the most natural.

#2 feels less natural but not exactly wrong. It has the same meaning as #1.

#3 is not natural.

Note that the choice between "on" and "for" depends on the role of the phrase within the sentence. For example, you would say "that was a mistake on my part", not "that was a mistake for my part".
Comments  
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I just ran a Google search and came accross your post.

I used the phrase "from my part" in the following sentence:

"Thank you also from my part, Paul." To thank Paul for something done by a friend of mine for which Paul was already thanked.

Does it still sound unnatural to you?

Thanks,
William
Why not keep it terribly simple and say either " please accept my thanks also Paul" or " I would like to thank you too" etc etc. There are a number of ways to offer thanks without getting unnecessarily wordy. "From my part" does not sound right in this instance anyway.

There must be sincere effort on your part

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anonymous

There must be sincere effort on your part

Add a period at the end, and you've got it. "On my part, I prefer living in the country." is wrong. "On my part" does not mean that. It means what it does in your sentence.

All correct.

All have same meaning. As regards to, concerning.