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LingakuLingakuNote: Replace ない of the plain negative form with ざるを得ない. Exception: する → せざるを得ない (not さざるを得ない).
The grammar structure ～ざるを得ない expresses that one has no choice but to do something, or cannot help but do something. It conveys a sense of reluctance or inevitability – the speaker feels compelled by circumstances to take an action they might not otherwise choose.
This is a formal, somewhat literary expression often found in written Japanese, news, business contexts, and formal speech.
Attach ざるを得ない to the negative stem (未然形) of the verb – that is, replace ない from the plain negative form with ざるを得ない:
Important exception:する does not become さざるを得ない. Instead, it uses the classical negative stem せ:
The key nuance of ～ざるを得ない is reluctance combined with inevitability. The speaker acknowledges that the action is undesirable or unplanned, but external circumstances make it unavoidable.