Grammar Info
N5 Lesson 4: 13/13
い-Adjectives くない い-Adjectives (negative) Not (adjective) い-Adjectives, whether positive or negative, cannot be used with だ
Structure
Casual
Formal
[い]Adjective[く]+ ない

Examples:
おもしろ + ない
新し + ない
[い]Adjective[く]+ ない + です
[い]Adjective[く]+ ありません

Examples:
おもしろ + ない + です
おもしろ + ありません

新し + ない + です
新し + ありません
Details
Part of Speech Adjective
Word Type Auxillary Verb
Register Casual
品詞 形容詞
単語の種類 助動詞
使用域 タメ語
Information
The negative form of い-Adjectives in Japanese is created by using the 連用(れんよう)form of the adjective, followed by ない. The 連用(れんよう) form just means ‘conjunctive’ in Japanese. For い-Adjectives, this conjunctive form is created by removing い, and replacing it with く.
  • あなた悪(わる)くない
    You are not to blame. (Translates directly to, you are not bad.)
  • 今日(きょう)暑(あつ)くない
    It is not hot today.
The ない used with い-Adjectives is considered to be a different word to the ない used with verbs. When used with い-Adjectives, ない is also an い-Adjective. This means that it follows the same rules as regular い-Adjectives. Due to ません (the polite negative form) being an auxiliary verb, it cannot be conjugated with い-Adjectives in the same way as verbs.
  • このお茶(ちゃ)、温(ぬる)くません。
    This tea don't lukewarm. (Incorrect example with incorrect English to match!)
  • このお茶(ちゃ)、温(ぬる)くありません
    This tea is not lukewarm. (Correct example)
As can be seen here, you must first add the verb ある, and then conjugate ある into the negative form using the auxiliary verb ません. This is how the polite negative is created.
Caution: As with regular い-Adjectives, you cannot use after ない. です is acceptable to create a semi-polite form, but is considered spoken language only.
Slow Male
Hide All
Hide Japanese
Hide English
暑(あつ)ないです。[暑(あつ)]
It is not hot.
[polite form]
Play  
Online
GuideToJapanese
Imabi
Books
Genki 1
Page 132