Grammar Info
N5 Lesson 3: 13/13
い-Adjective かった い-Adjective (past) Was, Were (past tense) い-Adjectives, whether positive or negative, cannot be used with だ
Structure
Casual
Formal
[い]Adjective[+ かった

Examples
おもしろ + かった
新し + かった
[い]Adjective[+ かった + です

Examples
おもしろ + かった + です
新し + かった + です
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
In order to create the past form of い-Adjectives, you must add the auxiliary verb た to the ‘past’ conjunction form of the い-Adjective. The past conjunction form is created by removing the い and replacing it with かっ. This structure is equivalent to ‘was’ in English.
面白(おもしろ)い - Base (dictionary form)
面白(おもしろ)かっ - Form used with た (and several other auxiliary verbs)
  • お風呂(ふろ)温(あたた)かかった
    The bath was warm.
  • 昨日(きのう)夜(よる)寒(さむ)かった
    Last night was cold.
From these examples, we can see how the casual past form is constructed. In modern Japanese, simply adding です after た is considered to be the standard polite past form.
  • 京都(きょうと)涼(すず)しかったです
    Kyoto was cool (temperature).
  • このケーキ甘(あま)かったです
    This cake was sweet.
Caution: Although this is considered to be polite by most people, using です after かった is not correct Japanese. However, considering how common its usage has become, it can be used in any situation confidently.
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寒(さむ)かった。[寒(さむ)]
It was cold.
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Genki 1
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