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Grammar detail: に違いない(にちがいない)

に違いない(にちがいない)  certainly
70 words
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verb plain form / noun / な adjective / い adjective
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ちが
いない
means
certainly; there is no doubt that ~
.
に違いない is a useful expression which can be appended to a plain form expression or just a noun/adjective to indicate that, in the speaker's view, there is no doubt that something is the case.
としてしまった
ちが
いない

I must have lost it.
かれ
つい
まれてしまった
ちが
いない

He must have accidentally got dragged into it.
In more polite speech に違いありません would be used instead.
だれそれそこ
わす
れていった
ちがいありません
Someone must have left it there.
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Kanji used in this grammar

イ   different   ちが to be different   ちがえる to change, alter, vary   
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ラク   おちる to fall   おとす to drop (something)   
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ヒ   かれ he   
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カン   roll up   ま to roll (up)   まき roll, reel, volume   
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crowded   こ to be crowded   こめる to load; to include   
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ボウ   わすれる to forget   
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