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Grammar detail: に違いない（にちがいない）

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JLPT:
に違いない（にちがいない） - certainly
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verb plain form / noun / な adjective / い adjective
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に
ちが
違
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.
DETAILS
お
落
としてしまったに
ちが
違
いない。
I must have lost it.
In more polite speech に違いありません would be used instead.
DETAILS
だれかが、それをそこに
わす
忘
れていったのにちがいありません。
Someone must have left it there.
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Kanji used in this grammar

違
イ   different   ちがう to be different   ちがえる to change, alter, vary   
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3
落
ラク   おちる to fall   おとす to drop (something)   
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3
忘
ボウ   わすれる to forget   
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3
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