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As I understand, they are both very close in terms of meaning.

E.g.

私は歌を歌えないわけではないが、人前で歌うのは恥ずかしい。
私は歌を歌えないことはないが、人前で歌うのは恥ずかしい。

Both sentences would mean: "It's not that I cannot sing, it's just that I get embarrassed in front of others."

I'm pretty sure there is a slight difference in nuance, that I can't quite grasp yet.

Is it a matter of opposing the belief of someone that you can't? (while the other is plainly a statement?)

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  • する doesn't work like "(when I) do" in this context. See: Can する substitute a previously used verb?
    – naruto
    Commented Sep 26, 2022 at 4:07
  • I'm a bit confused, was this comment meant for another post?
    – 悪戯猫
    Commented Sep 26, 2022 at 10:52
  • I wanted to point out "人前ですると" made little sense here. You wrote すると because you thought it's a correct way of saying "if I do", right?
    – naruto
    Commented Sep 27, 2022 at 2:57
  • Oh, I just saw the original... It was a random copy-paste example, now that you mention it it makes little sence indeed. I didn't even bother to read it to be honest, I focused mainly on the difference between the 2 points. Thanks for pointing it out!
    – 悪戯猫
    Commented Sep 27, 2022 at 18:19

2 Answers 2

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There is very little difference, and they are interchangeable most of the time. Still, I feel the speaker is more aware of the previous context when わけではない is used. That is, a sentence using わけではない tends to have a nuance of "that is not to say", "that doesn't mean" or "I'm not saying". ことはない is a relatively "plain" double-negative sentence.

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Not sure if this is what you are looking for, but -タ form seems to behave differently for the two constructions. As I see it, なかったことはない coincides with another construction -たことがある, which takes precedence. なかったわけではない doesn't have the same problem.

私は歌が歌えなかったことはないが、人前で歌うのは恥ずかしかった。

Most people will read this as "I have never been unable to sing" (="I always could"). The other interpretation ("It's not that I couldn't sing"="I could to some extent") might not be impossible, but it would be much harder to read that way.

Whereas, the same doesn't happen when you change ないわけではない to なかったわけではない.

私は歌が歌えなかったわけではないが、人前で歌うのは恥ずかしかった。

The only difference from the original sentence is that it describes a past event.

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  • Thanks for the Insight! Indeed, as @naruto mentioned before, ことはない is a plain negation so whether ない・なかった comes before, it is a simple "plain" double-negation. To my estimation so far it seems like わけではない is more close to: "It's not that...". It's as if you are explaining or disagreeing with the other person's guess/estimation. In that case the Past-Sentence example puts things in their place clearly.
    – 悪戯猫
    Commented Sep 27, 2022 at 18:47
  • As I see it, the main issue in what I argued is a conflict with another construction -たことがある. I edited my answer to clarify.
    – Yusuke Matsubara
    Commented Sep 28, 2022 at 9:25

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