• ええ —Kansai, Tōhoku, Chūgoku

⟨yo₂si⟩ → */jəsi/ →/joɕi/ →/joki/ → */joɣi/ →/joi/ → */jiː/ →/iː/

Ultimately a shift from良い(yoi), classical良し(yoshi).

• (Tokyo)いい[íꜜì] (Atamadaka – [1])^[1][2]
• IPA^(key): [iː]

• Audio:

  (file)

いい• (ii) -i (adverbialよく(yoku))

1. (colloquial, informal)good
2. (colloquial, predicative only)enough, notwantedanymore

   酒(さけ)はもういい ―sake wa mōii ―I have hadenough sake.Idon’t want any more sake.

3. (ても~,て~)Indicates permission;can,may
4. (with verbs or adjectives in conditional/provisional)Indicates necessity or obligation;should do…,must do…

• Most often written in this form. The kanji spelling良い is generally reserved for moreformal writing.
• This form does notinflect — it is only used in the終止形(shūshikei,“terminal form”) and連体形(rentaikei,“attributive form”) ofii. All other grammatical forms are based on良い(yoi). Compare the連用形(ren’yōkei,“continuative or adverbial form”)yoku or the過去形(kakokei,“past tense”)yokatta; there is no *iku or *ikatta form.
• In ironic usages denoting “verybad” or “embarrassing”, this form is preferred to theyoi form.

• 頭(あたま)がいい(atama ga ii)

• IPA^(key): [ii]

いい• (ii) 

1. stem or continuative form ofいう(iu)[godan]

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