Grammar detail: いい, よい and 良い

いい, よい and 良い  forms of good
137 words
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いい is a special case of an い adjective. When inflected, the first い is typically replaced by よ. When written with kanji, the first syllable is sometimes read as い, and sometimes read as よ.
いい can also be appended to nouns to create a special class of adjectives that are inflected in the same way as いい. There are about 90 or so of these in Japanese. Some common examples include かっこういい, 品のいい, 気持ちいい, 運のいい.
For many of these unusual adjectives, various forms exist: sometimes the いい is represented in kana, and sometimes in kanji; sometimes の is placed between the word and the いい part and sometimes not; sometimes が is placed there and sometimes not. So for example, 質がいい might be seen in any of the following forms: 質が良い, 質がよい, 質のいい, 質の良い, 質のよい.
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Kanji used in this grammar

ヒン    elegance   しな goods   
キ   ケ    spirit   
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ジ   も to hold, to have   
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ウン   carry; luck   はこ to carry   
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シツ   シチ   チ    quality; substance   
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リョウ   よ good   
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