How to tell them apart
わけではない denies an implication without fully rejecting it, softening or clarifying what someone might assume. わけがない flatly says something is impossible or has no reason to be true. わけにはいかない means you can't do something because circumstances force you not to, even if you want to. The key is whether you are correcting a misunderstanding, ruling out a possibility, or blocked by an external constraint.
- わけではない Use わけではない when you want to deny an implication without rejecting everything outright.
- わけがない Use わけがない when you want to say something is impossible or has no reason to be true.
- わけにはいかない Use わけにはいかない when external circumstances prevent you from doing something.
| Grammar point | Meaning | JLPT level |
|---|---|---|
| わけではない wakedehanai | It is not the case that; not always so | N3 |
| わけがない wakeganai | There's no way; impossible; can't be true | N3 |
| わけにはいかない wakenihaikanai | unable to do; not permitted to do | N3 |
わけではない wakedehanai
It is not the case that; not always so
わけではない denies that something is universally or necessarily true, softening a statement to mean it does not always hold. It follows plain-form verbs and i-adjectives, na-adjectives and nouns with な, and often pairs with 必ずしも.
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貧しい人が必ずしも不幸なわけではないと言われている。
It is said that the poor are not always unhappy.
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世界一の金持ちでもすべてのものが買えるわけではない。
The richest man in the world cannot buy everything.
わけがない wakeganai
There's no way; impossible; can't be true
わけがない expresses strong denial, meaning something is impossible or there is no way it could be true. It follows plain-form verbs and い-adjectives, な-adjectives plus な, and nouns plus な or の. The tone is emphatic and works in both casual and formal speech.
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絵心がないから、風景を正確に写せるわけがない。
I have no artistic talent, so there's no way I can accurately depict the scenery.
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カナダ人ならそんなこと言うわけがない。
No Canadian would ever say that.
わけにはいかない wakenihaikanai
unable to do; not permitted to do
わけにはいかない follows a plain-form verb and expresses that something cannot be done, either because it is impossible or because it must not be done. It often carries a sense of social or practical constraint, as in being unable to allow or approve of something.
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この世のことは、何もかも知るというわけにはいかない。
We cannot know everything in the world.
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ケーキを食べてなおそれを持っているわけにはいかない。
You cannot eat your cake and have it too.
わけではない and わけがない and わけにはいかない are both JLPT N3 grammar points that Japanese learners often mix up. This page compares all 3 side by side on meanings, usage and example sentences, so you can tell them apart.