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I'm watching a Mario RPG translation video:
<https://www.youtube.com/watch?v=WRBRLmhFy-4>

[![enter image description
here](https://i.stack.imgur.com/HU0VC.jpg)](https://i.stack.imgur.com/HU0VC.jpg)

What I think I understand so far is: ながい おつきあいなだけに、= "Given that I've known
you a long time,"

Question 1: なにがあったか = "What happened..."

I think this is correct? However, I have been reading about か and I cannot
understand what it's function is here. I would like to know its purpose
please.

Question 2: 気付いてしまいました！ = "...I realize!" or "...now I realize!"

I am very unsure about my translation of this part. I think 気づいて is て form.
しまいました is confusing to me though. Does しま = polite affirmative する? Also いました,
I'm not sure about this. Is this supposed to be 今 past tense or いる past tense?
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translation definitions
What is キノピオ saying in Super Mario RPG? (includes picture)
Yes, this 何があったか is a noun clause meaning "what happened". か can form
something called an embedded question. See: [Usage of か after a
clause?](https://japanese.stackexchange.com/q/13034/5010)

気づいてしまいました is made of the te-form of 気づく and the polite-past form of the
[subsidiary verb](https://japanese.stackexchange.com/q/18952/5010) **しまう**.
Here, this しまう describes 気づく was an unintended and possibly-undesirable
action. Perhaps you can use "to happen to" in this case. If you are new to
しまう, please take the time to learn about it. It's very important and has
various usages.

> なにがあったか気づいてしまいました！  
>  I happened to notice what happened!
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answer