Is "ii yo" acceptable?


I've never heard someone say "ii yo". Is "ii yo" acceptable? And "ii zo"? In
particular, in casual masculine speech.




In English, it would be similar to casually saying "yeah, sure!".

Like:

  * Can I borrow your pen?
  * Yeah, sure!

* * *

  * ペン貸してくれる？
  * いいよ

いいぞ, is also correct but it's less standard. I never heard people actually use
that in my experience. But people talk in all kinds of weird ways. Imagine
someone saying the following in English: `Yeah bruh`

It's not standard but some people actually talk like that so culturally
speaking, it's not wrong.




いいよ (ii yo) is a **casual** way to say "okay", "no problem", "I'll do it",
etc.

  * It is **not** acceptable in formal/business settings. Don't use it.
  * It is commonly and actively used among friends, regardless of sex.
  * It is not common in some dialects where other expressions are used by default. Kansai-ben speakers would use ええよ or ええで.

いいぞ can be heard when cheering sport players (sounds like "way to go!"), but
otherwise uncommon in the real-world spoken Japanese. You can say this to
someone who is really inferior to or close to you (for instance your
children), but it tends to sound "bossy".

