ずにはいられない
(Zu ni wa i rare nai)
can't help doing / can't stop oneself from.
Connection rules
- +V ない-stem + ずにはいられない. Irregular: する → せずにはいられない.
- +Involuntary action — 'can't stop oneself'.
- +Irregular: する → せずにはいられない (not しずに).
Examples
1.
あまりにもおかしくて、笑わずにはいられなかった。

Amarini mo okashiku te, warawa zu ni wa i rare naka ta.
It was so funny, I couldn't help but laugh.
「can't help doing / can't stop oneself from」
2.
彼の優しさに、感動せずにはいられない。

Kare no yasashi sa ni, kandou se zu ni wa i rare nai.
I can't help being moved by his kindness.
「can't help doing / can't stop oneself from」
Practice
When I saw that beautiful scenery, I couldn't help but write a poem.
あの美しい景色を見て、詩を___。
Romaji also accepted