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I know the word 틀림없다 means "to be free of mistakes, to be certain, to be correct", and that it can also mean "it must be". So I have seen the following expression with a verb (as a noun):

악몽과 같았음에 틀림없다
It must have seemed like a nightmare. = It must have been a nightmare.

That's a verb converted to a noun using the (으)ㅁ form with the particle 에.

But then I see it used with -는 것:

매우 신나는 것임에 틀림없다.

1) Why does the noun 것 need to have 이다 + (으)ㅁ added when 것 s already a noun?
Why not just:

매우 신나는 것에 틀림없다.

Finally, I see other versions, without 임 and with the subject marker 이 instead of 에:

매우 자랑스러워 할 것이 틀림없다.
행복한 것임이 틀림없다.

2) Are they all correct and natural? Is it just up to preference?


For learning: Korean
Base language: English
Category: Language


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    Best Answer - Chosen by the Asker
    Hehe. Your question is very interesting.
    I've never though about that... (because I'm a native^^)

    Well I think the reason is...

    "틀림없다" literally means "is not wrong", so it should have a certain fact as a subject.

    "그것은 매우 신나는 것에 틀림없다" -> Very exciting thing is not wrong. (somewhat unnatural)
    "그것은 매우 신나는 것임에 틀림없다" -> It is not wrong that it is very exciting.

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