Verb ずにはおかない

When to use

Formal, literary "will inevitably.../is bound to" - emphasizes an unavoidable natural consequence.

Explanation

The ずにはおかない grammar point conveys the sentiment of an inevitable action or a strong emotional compulsion. It can mean 'I can’t let it pass without doing X' or 'I definitely will do X'.

• 彼かれが困こまっていると聞きいたら、助たすけずにはおかない。

  If I hear he is in trouble, I cannot help but assist him.

  Kare ga komatte iru to kiitara, tasukezuni wa okanai.

• 食事しょくじの準備じゅんびがこのままだと、手伝てつだわずにはおかないだろう。

  If the meal prep stays like this, I won't be able to stop myself from helping.

  Shokuji no junbi ga kono mama da to, tetsudawazuni wa okanai darō.

• この問題もんだいが解決かいけつしないなら、改善かいぜん策さくを考かんがえずにはおかない。

  If this issue isn't resolved, I can't help but think of a solution.

  Kono mondai ga kaiketsu shinai nara, kaizen-saku o kangaezuni wa okanai.

• 彼女かのじょが泣ないているのを見みたら、慰なぐさめずにはおかない。

  When I see her crying, I cannot help but comfort her.

  Kanojo ga naite iru no o mitara, nagusamezuni wa okanai.

Inevitable (Cannot Help But)

• Verb ざるを得ない~ zaru wo enaiN1'Cannot but', 'have no choice but to', 'forced to'
• ～ざるを得ない〜zaru wo enaiN2Have no choice but to; cannot help but.
• Verb ないではすまないVerb nai dewa sumanaiN1'Cannot end without doing', 'must do' - an unavoidable…
• Noun を禁じ得ない〜wo kinjienaiN1'Cannot help but do', or 'inevitable'
• ～よりほかない〜yori hoka naiN2Express that there is no other choice; 'have no choice…
• ～ではすまない〜dewa sumanaiN1Expresses that just doing something is not enough or will…
• Noun だけではすまないNoun dake dewa sumanaiN1Expresses 'it can't be settled with just...', 'cannot be…

Compare when to use each