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"I think", "I guess" and "I reckon"(not the meaning of to calculate) share the almost same meaning, I think. If so, what kind of nuance do they have?
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I think is the most formal and I reckon is the least.
Mister MicawberI think is the most formal and I reckon is the least.

Thanks for clearing it up, Mr. Micawber. And what a coincidence! My hometown is Yokohama and I still live here.
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I reckon is hardly used at all where I live. I associate it with the southern U.S. It's more similar to I guess than to I think.

The usage of I think and I guess can be quite different.

You use I think to express an opinion. It may have a forward-looking, positive feel.

I think high fructose corn syrup is responsible for obesity in children.
I think we should collect signatures so we can get this law repealed.
I think you'll do very well on your exam.


(I would not use I guess (I reckon) in any of the statements above.)
__________

You use I guess to give your estimate of a situation. It can express powerlessness to do anything about the situation as well -- or at least the idea of resignation to the situation. It's somewhat more backward-looking.

I guess I've lost the lottery again. I don't have any of those numbers. (sigh)
I guess you'll have to start over, now that you've ruined that batch.
I guess I must have got the wrong number because the call's not going through.


(I would not very likely use I think in any of the statements above -- certainly not with the first of the three, although possibly for the third.)
__________

There is some overlap, however.

CJ
"Reckon" is also used in the UK, with the same amount of informality.
My hometown is Yokohama and I still live here.
Come by and see me in Uchikoshi sometime.
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Omo"I think", "I guess" and "I reckon"(not the meaning of to calculate) share the almost same meaning, I think. If so, what kind of nuance do they have?
Somewhere I read the difference between I think and I believe:

I think - you know the reason and based on some thesis you are expressing your idea.

I guess - you may not reason it carefully, but you are guessing on the spot with a positive opinion. Here you may not have done any research before you express your idea.
Omo"I think", "I guess" and "I reckon"(not the meaning of to calculate) share the almost same meaning, I think. If so, what kind of nuance do they have?
Showing my age, I associate "reckon" with cowboy movies of the 1940's and country&western music: "How it beckons, and I reckon/ I would work for any wage/To be free again, just to be again/ Where the bloom is on the sage." (Gene Autry)
I also associate "I reckon" with either cowboys or hillbillies. It always surprises me to come across it in the Harry Potter books -- I think it must have a higher social standing in the U.K. than in the U.S.
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