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I want to write phrase "Capital of A is B, or I'm mistaken?", but I'm not sure that the second part of thus phrase is correct. Should I write "... or I've made a mistake?", or "... or I'm wrong?"? What is the best?

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"The capital of A is B, or am I mistaken?" – user21497 Jan 1 '13 at 15:20
No reason to downvote this question from a non-native speaker of English. ELL isn't in beta yet. When will it be in beta? – user21497 Jan 1 '13 at 15:23
Thank you, Bill. I was interested what is the ELL, but found the answer: It is "English Language Learners" new site than is discussed to be created in the stack exchange universe. area51.stackexchange.com/proposals/41665/… – bessarabov Jan 1 '13 at 15:51
up vote 3 down vote accepted

As the question stands, the OP asks if (forms of) mistake can be used as other than a noun (Should I write "... or I've made a mistake?").

In that sense, the "Capital of A is B, or I'm mistaken?" is correct in the use of mistaken as an adjective.

mis·tak·en /məˈstākən/
1. Wrong in one's opinion or judgment.
2. (esp. of a belief) Based on or resulting from a misunderstanding or faulty judgment: "an unfortunate case of mistaken identity".

Incidentally, minor errors of grammar need correction:
"The capital of A is B, or am I mistaken?"
is how you would write the sentence.

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What you’re looking for is “...if I’m not mistaken,” but it's rather a cliché. “...if I remember correctly” is not much better. “...I believe” is a bit more honest.

Expressing a little doubt in these clichéd expressions actually indicates certainty: you know you’re not mistaken, and it’s a false modesty.

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Actually, I think he’s looking for “. . . unless I’m mistaken.” – tchrist Jan 1 '13 at 15:22

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