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#1 Okay son, what's troubling you? Tell me what's on your mind.
#2 At this point, I don't know what the designers have in mind for the new project.

I think the above usage is correct for 'on mind' vs 'in mind' to mean something that you are thinking inside your brain. But is there any rules as to when you should pick one over the other? Anybody?
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Something that is in mind is something you are thinking about. Something that is 'on your mind' is something you are worrying about, not just thinking about.
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Hi nona,

I never thought of it in those terms, but now that I think about it...it make a lot of sense! Thanks.
on my mind also has the meaning of: focus of thought/attention as in the song " Alway on My Mind " for example.
Always on my mind by Willie Nelson

Maybe I didn't treat you
Quite as good as I should have
Maybe I didn't love you
Quite as often as I could have
Little things I should have said and done
I just never took the time
You were always on my mind
You were always on my mind

Maybe I didn't hold you
All those lonely, lonely times
And I guess I never told you
I'm so happy that you're mine

If I made you feel second best
Girl I'm so sorry I was blind
You were always on my mind
You were always on my mind

Tell me, tell me that your sweet love hasn't died
Give me, give me one more chance to keep you satisfied, satisfied

Little things I should have said and done
I just never took the time
You were always on my mind
You were always on my mind
You were always on my mind

My2sense, that is absolutely a beautiful song...one of my favorites.

I think here again you could argue that the guy was constantly thinking about her wondering how he could express his love toward her...and wondering if she was going to leave him, etc. Compare that situation to...let's say a car sales person comes to you and says "Honda Accord is the best midsized family sedan you can buy today. And right now you can get $3,000 factory rebate." Then you might answer by saying "That's sounds great. I am going to shop around some more, but I will certainly keep that in mind"...meaning you will think about it, but not be worried about it.

Thanks for your feedback...it's appreciated.
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