〜わけにはいかない

〜わけにはいかない expresses cannot / must not — communicating the speaker's degree of certainty, judgment, or attitude about a statement. Modal expressions in Japanese range from strong conviction to vague possibility, and choosing the right one conveys important nuance about how sure you are.

This is an upper-intermediate pattern common in natural conversation and media like news, novels, and dramas.

When to Use#

• When something is not an option due to social or moral reasons
• When you can't do something even though you might want to

When NOT to Use#

• When a different nuance than "cannot / must not" is intended — check the related patterns below

Example Sentences#

• 私は嘘をつくわけにはいきません。 — I absolutely cannot tell lies.
• 確定申告を怠るわけにはいきません。 — I cannot neglect filing my tax return.
• 納税を拒否するわけにはいきません。 — I cannot refuse to pay taxes.

Practice#

Try reading these sentences aloud, then check the translation and vocabulary:

Common Mistakes#

1. Using 〜わけにはいかない interchangeably with 〜ようにも〜ない — These patterns are similar but not identical. 〜ようにも〜ない (cannot even if one wants to) may be preferred in different contexts or registers.
2. Direct translation from English — The concept expressed by 〜わけにはいかない may not map one-to-one with its English translation. Focus on understanding the Japanese usage through example sentences rather than relying on the English gloss.

Related Patterns#

• 〜なければならない (must / have to) — Next step
• 〜ようにも〜ない (cannot even if one wants to) — Similar