わけではない is for denying an assumption, but not implying that the opposite is true: “It’s not like….”, “It doesn’t mean that….”, “It’s not necessarily….”
あの男しかいないわけではないよ。It’s not like there isn’t anyone else out there.
彼は決して勇気がないわけではない。He is certainly not without courage.
It might seem similar to the 〜くはない I posted about a while back. They both deny one thing X but imply that the opposite of X also isn’t quite right. When we use わけではない, though, we acknowledge that whatever we’re denying was already considered or could be easily considered as a possibility, even if it wasn’t stated outright: “(I know that you might think xyz) but that isn’t necessarily true.”
はずがない is for emphatically denying an assumption, or for discounting a prediction about a future event: “there’s no way X….”
–It’s a bit subjective, based on opinion or expectation rather than logic.
–You might also hear はずもない.
–It’s mostly used for statements that aren’t actually certain or proven
これは本物のダイヤであるはずがない。This can’t be a real diamond.
彼女が３０歳以上であるはずがない。まだ２０代であるにちがいない。She can’t be over thirty; she must still be in her twenties.
Confusingly, there is also a form わけがない which is for strongly denying something—it’s closer to はずがない than わけではない: “as if that could be true!”
–In conversation the particle が is usually dropped.
–It’s a bit more objective than はずがない, based on logic
–It’s used for possibilities that are logically impossible
–Based on my own personal observation, わけがない is often used emphatically or emotionally followed by よ, でしょう, or some other exclamatory particle,
–はずがない, on the other hand, is usually stated a bit more calmly.
彼には日常必需品すらない、まして贅沢品はあるわけがない。He has no daily necessities, much less luxuries.
そんなこと、分かるわけないでしょう。How should I know?
わけではない = Expressly denying one previously mentioned or assumed statement without saying the opposite is true: “It’s not like….. (necessarily).”
はずがない=Making an emphatic prediction or opinion that something cannot be true: “There’s no way….”
わけがない=Saying that something cannot possibly be true based on reason and logic:“There’s absolutely no way…!” “How could you possibly think that…..?”
Yes, the difference between the last two is difficult to really get, as always (and there are situations where either one sounds good and only the nuance changes)
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