わけにはいかない
Cannot/must Not
わけにはいかない (Cannot afford to / It wouldn't be right to)
〜ないわけにはいかない (Cannot afford NOT to / Must do)
How It Works
The pattern わけにはいかない is used when a speaker feels a strong internal or external pressure to behave (or not behave) in a specific way. While you might physically be able to do the action, doing so would be irresponsible, shameful, or against social expectations. It is generally not used with adjectives or nouns.
Key Nuances:
- Social/Moral Duty: Often used in business or formal situations where one's role or social common sense dictates their actions.
- First-Person Subject: Because it expresses a personal psychological burden, the subject is almost always the first person ('I' or 'we'). To use it for a third person, conjectural endings like だろう or らしい must be added.
- Non-volitional Verbs: While often used with volitional actions, it can also be used with non-volitional verbs (e.g., 負ける, 死ぬ) to express a strong determination not to let an undesirable state occur.
- Contrast with なければならない: While なければならない expresses a neutral, objective necessity, わけにはいかない emphasizes the reason or social pressure that makes an alternative impossible.
- No Potential Form: Do not use the potential form before this pattern (e.g., ❌ 休めるわけにはいかない). The inability comes from the situation, not physical capability.
- Common Pairings: This pattern is typically preceded by clauses ending in から, ので, or 以上 to establish the situational pressure.
- Continuous Form: It is frequently combined with the 〜ている form (e.g., 休んでいるわけにはいかない - 'cannot afford to be resting right now') to emphasize that one cannot continue a current state.
- Variant わけにもいかない: The particle も can replace は to form わけにもいかない. This adds a nuance of 'even if I wanted to, I can't' or softens the statement slightly.
Grammar Structure:
1. Verb (Dictionary Form) + わけにはいかない: 'Cannot afford to [do]' / 'It wouldn't be right to [do]'.
2. Verb (ない form) + わけにはいかない: 'Cannot afford NOT to [do]' / 'Must [do]'. This often carries a nuance of reluctance: 'I might not want to do this, but given the circumstances, I have no choice but to do it.'
Note: In polite speech, use わけにはいきません. In highly formal business contexts, the variant わけには参りません is often used.
Examples (5)
- 明日は大事な試験があるから、今夜は遊ぶわけにはいかない。
I have an important exam tomorrow, so I cannot afford to go out and play tonight.
Word by Word: Tomorrow important exam exists because, tonight play reason-as-for go-not.
The speaker is physically able to play, but the situation (the exam) makes it irresponsible to do so.
- 社長に頼まれた仕事なので、やらないわけにはいかない。
Since it's a job the president asked me to do, I cannot afford not to do it.
Word by Word: President-by was-asked work since, do-not reason-as-for go-not.
Using the double negative (ない form + わけにはいかない) creates a strong sense of obligation and often reluctance: 'I cannot not do it, even if I might not want to.'
- 車で来たので、お酒を飲むわけにはいきません。
Since I came by car, it wouldn't be right for me to drink alcohol.
Word by Word: Car-by came because, alcohol drink reason-as-for go-not (polite).
This is a social and legal constraint. Drinking is physically possible, but morally and legally prohibited because the speaker is driving.
- 病気の友達を一人にするわけにはいかない。
I can't just leave my sick friend alone.
Word by Word: Sick friend (object) alone make reason-as-for go-not.
This reflects a personal moral choice or sense of loyalty.
- いくら反対されても、この計画を中止するわけにはいかない。
No matter how much opposition there is, we cannot afford to cancel this plan.
Word by Word: No matter how much opposition is-done, this plan cancel reason-as-for go-not.
This shows the pattern used for a group's obligation or a professional commitment.
Common Mistakes
Using it for physical inability or lack of skill.
漢字が難しすぎて、書くわけにはいかない。漢字が難しすぎて、書けない。If you lack the skill to do something (like writing difficult kanji), use the potential form. わけにはいかない is for when you can do it but shouldn't.
Confusing the positive and negative forms.
行かなければならないから、行くわけにはいかない。行かなければならないから、行かないわけにはいかない。To say 'I must do it,' you need the double negative: 〜ないわけにはいかない. The positive form means 'I must NOT do it.'
How It Connects
Learn This First
To understand 'wake ni wa ikanai', you first need to understand the noun 'wake' which refers to reasons or circumstances. The pattern also relies on the topic marker 'wa' for emphasis and the plain negative form of verbs to express the inability to act based on those circumstances.
- わけReason/means
The noun 'wake' (reason/circumstance) is the core component of this expression, providing the conceptual basis for circumstantial inability.
Level 2 - はTopic Marker
The topic marker 'wa' is used here to emphasize the specific circumstance or reason being discussed.
Level 1 - ない形Plain Negative
The pattern ends with the negative form of the verb 'iku' (to go), requiring knowledge of plain negative conjugations.
Level 2
Related Patterns
- ことができるCan/able to
Used for general ability or possibility, whereas わけにはいかない is specifically for situational or moral constraints.
Level 2 - わけではないNot Necessarily
A similar-looking pattern that means 'it's not that...' (partial negation), rather than expressing inability.
Level 3 - わけがないNo Way/impossible
Expresses a strong logical denial ('there is no way that...'), while わけにはいかない is about social/moral restraint.
Level 3 - ざるを得ないCannot Help but
Similar to the negative form (must do), but implies being forced by external circumstances beyond one's control, whereas わけにはいかない often involves a personal sense of duty.
Level 3 - なければならないMust/have to
A general way to express 'must.' わけにはいかない is more subjective, focusing on the 'reason' or 'social pressure' why one cannot act otherwise.
Level 2 - てはいけないMust Not
A direct prohibition ('must not'). わけにはいかない is a more indirect, reason-based way to say one cannot do something.
Level 2
Words in This Pattern
Practice わけにはいかない in Bubblegum
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