いい
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Base i-adjective form. Irregular: it uses 『いい』 (ii) in present affirmative, but conjugates from the stem 『よ』 (yo) for other forms (e.g., negative, past).
Theme
At a café, User and Ken are discussing a new movie they just watched together.
いい
いい
good
Core Language Building BlocksCore Adjectives
Memory Hook
Imagine giving a thumbs-up and saying 'Ee!' (いい ii) for something good. 'Ee!' sounds like 'yay!' — it's good!
Cultural Note
『いい』 (ii, 'good') is the most common way to express approval or satisfaction in daily conversation. It's often used in phrases like 『いいですね』 (ii desu ne, 'that's good, isn't it?') to show agreement or appreciation.
Forms
Base: いいBase i-adjective form. Irregular: it uses 『いい』 (ii) in present affirmative, but conjugates from the stem 『よ』 (yo) for other forms (e.g., negative, past).
Negative: よくないUse stem 『よ』 (yo) + 『くない』 (kunai, negative) → 『よくない』 (yokunai, 'not good').
Past: よかったUse stem 『よ』 (yo) + 『かった』 (katta, past) → 『よかった』 (yokatta, 'was good').
Adverbial: よくUse stem 『よ』 (yo) + 『く』 (ku, adverbial) → 『よく』 (yoku, 'well').
Comparative: よりいいComparative formed with modifier 『より』 (yori, 'more than') + base adjective 『いい』 (ii, 'good').
Superlative: 一番いいSuperlative formed with 『一番』 (ichiban, 'number one / Most') + adjective 『いい』 (ii, 'good').