〜に違いない (~ni chigai nai) — must be / I'm sure
Seeing the evidence and concluding, with confidence, that it must be so.
Formula (सूत्र ढाँचा)
Grammar rule (व्याकरण नियम र परिभाषा)
When to use it
You meet it more in writing and fairly formal speech; among friends people often just say 「絶対〜よ」.
Meaning
When the evidence in front of you leads to one conclusion, 「〜に違いない」says it must be so.
How to attach
With な-adjectives and nouns, drop だ and attach it directly: 「病気に違いない」.
Versus what you know
N4It is far stronger than かもしれない (maybe) and firmer than でしょう — but it is still your inference, not a fact.
Examples (उदाहरणहरू)
部屋の電気がついている。彼はまだいるに違いない。
へやのでんきがついている。かれはまだいるにちがいない。
The light is on. He must still be there.
How it is built (कसरी बन्यो) いる is the plain form of the verb → add に違いない directly → from the evidence of the light being on, it concludes "he's surely there".
あの店はいつも人が多い。おいしいに違いない。
あのみせはいつもひとがおおい。おいしいにちがいない。
That place is always crowded. It must be good.
How it is built (कसरी बन्यो) おいしい is an い-adj → add に違いない directly → from the evidence of the crowd, it says "it must be tasty".
今日休みだ。彼は病気に違いない。
きょうやすみだ。かれはびょうきにちがいない。
He's off today. He must be ill.
How it is built (कसरी बन्यो) 病気だ is a noun → drop the だ → then add に違いない → 病気に違いない.
Knowledge check (मिनी ज्ञान जाँच)
「へやが暗い。もう寝た＿。」— which is right?
💡 Hint: A confident inference from evidence.
〜に違いない = it must be so, based on evidence.
Which form comes from 「病気だ」?
💡 Hint: Drop the だ.
Nouns and な-adjectives drop だ and attach directly.
Which is the strongest inference?
💡 Hint: The "surely" one.
かもしれない < でしょう < に違いない in strength.
Your score: /3