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Reading "プラチナデータ" by 東野圭吾.

Not clear on the meaning of: "俺、何度も彼女を殺しそうになったもんな" - "I often almost killed her ... (monna?)"

What is "monna"? I suppose "mono nara" ("if that thing"), but then I don't understand the whole sentence - is it "If I often almost killed her"?

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3 Answers

More than anything, it is a colloquial way of adding the nuance of "retrospective confession or boasting" in my own words.

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It's a variation of entry 2イ here:

http://dictionary.goo.ne.jp/leaf/jn2/219750/m0u/

As Goo says, it's basically an exclamatory way to state a reason for something, 「詠嘆の意をこめて理由を表す」. I don't have the context in this case, but I would say that in most cases the meaning is approximately the same as

俺、何度も彼女を殺しそうになったからな

and I would give the English translation as roughly

I did almost kill her several times, didn't I...

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Thanks for the replies! This sentence is uttered by a character being interrogated by the police, boasting about his "prowesses" with his 彼女 using a special device called a "電トリ ". I would probably go with "もんな" -> "からな", since the character is not offering any reason other than boasting he is really proud of himself... –  Swalbol Oct 24 '13 at 7:19
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I think that it comes from the grammar form ~もの + だ. Which when changed to casual becomes もんだ which then you could add a な to.

ものです-> もんだ->もんだな->もんな

I think this may be a usage of 'reason/explanation' version of ~もの, perhaps in a sentence before or after the character is talking about why he had often almost killed her?

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nope, the 丁寧語 of なったもんな is なりましたもんな, not なったものですな. This is a sentence ending particle, not a formal noun. –  dainichi Oct 23 '13 at 7:48
    
I'm not really sure what your comment is in reference to, but what I'm trying to explain is that the もんな from the poster's question comes from もの and な. I edited the question so hopefully that is more clear –  ishikun Oct 23 '13 at 8:31
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Ishikun. I thought your answer was good. –  Kirk Oct 23 '13 at 8:38
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It's correct that it comes from もの+な, but ものです is not relevant. –  dainichi Oct 23 '13 at 9:41
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@ishikun Let me try and see if I can get it right: a formal noun (形式名詞) is like a noun in form, so it can turn the clause before it into a relative clause and be followed by だ. (As a formal noun, もの is a nominalizer.) But since this is the sentence final particle (終助詞), it doesn't act like a noun, and you can't put だ after it any more than you can put だ after よね. (Plus, it can come after だ, something no noun can do.) –  snailboat Oct 23 '13 at 11:42
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