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negating い adjectives


So far I've been learning that to negate an い adjective I have to substitute い with くない:

高いです。-> 高くないです。

But now I see in another online course that they replace い with くand add ありませ:

高いです。-> 高くありません。

Which one is more common? Is one of these more informal than the other?

For learning: Japanese
Base language: English
Category: Language



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    Best Answer - Chosen by Voting
    高くありませんis more formal japanese
    if you want to say "not expensive" to teacher or older people, you should use 高くありません not 高くないです

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