Japatan
Formação
- V普通形 + に違いない
- いA + に違いない
- なA + に違いない
- N + に違いない
Explicação
Used when you feel sure about something based on what you have seen or heard. It is stronger than だろう or かもしれない. Na-adjectives and nouns connect directly, without だ. It is common in writing; in conversation people often say きっと〜だ instead.
Exemplos
電気が消えている。田中さんはもう 帰ったに違いない。
The lights are off. Tanaka must have gone home already.
こんなに人が並んでいるから、あの店のラーメンは おいしいに違いない。
With this many people lining up, that shop's ramen must be good.
マリアさんはいつも図書館にいる。本が 好きに違いない。
Maria is always in the library. She must love books.
あの背の高い人は、バスケットボールの選手に違いない。
That tall person must be a basketball player.
Observações
~はずだ is a logical conclusion from facts or reasons; ~に違いない shows the speaker's strong personal conviction. Do not insert だ: 好きだに違いない is wrong.
Gramática relacionada
Miniquiz
1窓が開いている。だれかが部屋に（ ）に違いない。
Resposta e explicação
Resposta: 2 入った
The window is open. Someone must have come into the room. Verbs take the plain form before に違いない, so 入ったに違いない is correct.
2佐藤さんの顔がとても赤い。熱がある（ ）。
Resposta e explicação
Resposta: 4 に違いない
Sato's face is very red. She must have a fever. The speaker is sure based on what they see, so に違いない is correct. The others cannot follow ある in this form.
3彼の部屋はいつもきれいだから、掃除が（ ）に違いない。
Resposta e explicação
Resposta: 1 好き
His room is always clean, so he must like cleaning. A na-adjective connects directly without だ or な: 好きに違いない.
