〜に違いない expresses the speaker''s strong conviction — "it must be," "there''s no doubt that," "I''m certain."
Strong certainty - Confident conclusion based on evidence
Logical deduction - Drawing a conclusion from what you know
She must be tired.
Stronger than だろう or かもしれない — you''re quite confident.
Attachment
- Verb plain form + に違いない
- i-adj + に違いない
- na-adj + に違いない
- Noun + に違いない
Hiragana variant: にちがいない (same meaning)
Polite: に違いありません
These footprints must be from a dog.
He must be the culprit.
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