()

よい
i-adjective
good, fine
See also: いい (casual/everyday form)
Conjugation
AffirmativeNegative
Present()()くない
Past()かった()くなかった
て form()くて()くなくて
Adverbial()
Conditional ば()ければ()くなければ
Conditional たら()かったら()くなかったら
1. good, fine
Of high quality or standard.
天気(てんき)()い。
The weather is good.
This restaurant has good food.
景色(けしき)()いです
The scenery is beautiful, isn't it?
He is smart.
Let's eat food that's good for the body.
2. all right, okay
Acceptable or permitted.
You may go home now.
May I take a photo?
May I sit here?
You don't have to eat it.
明日(あした)()いです
Is tomorrow okay?

()い is an i-adjective meaning "good" with an irregular form いい used in everyday speech.

FORMS:

  • Dictionary: よい or いい (いい is more casual)
  • Negative: よくない (NOT いくない)
  • Past: よかった (NOT いかった)
  • Adverb: よく (well, often)

GRAMMAR PATTERNS:

  • 〜てもいい/よい: may ~, it's okay to ~
  • 〜ばよかった: should have ~ (regret)
  • 〜なくてもいい: don't have to ~

COMMON COLLOCATIONS:

  • 天気(てんき)がいい: good weather
  • (あたま)がいい: smart
  • (からだ)にいい: good for the body
  • (なか)がいい: on good terms
  • (うん)がいい: lucky

IMPORTANT:
Always conjugate from よ-, not い-. "It was good" = よかった, not いかった.

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