Grammar Info
N3 Lesson 1: 2/22

といい
it would be nice if, it would be good if, should・I hope

Structure
Casual
Polite
Verb[たら]+ いい
Verb[ば]+ いい
Verb + + いい
Verb[たら]+ いい + です
Verb[ば]+ いい + です
Verb + + いい + です
Details
Register Standard
使用域 一般
Information
When any of the 接続助詞(せつぞくじょし) (conjunction particles) that carry the meaning of ‘if’ (たら, , or ) are paired with the い-Adjective, いい, they will express the desired result of the speaker. These all translate to ‘it would be nice if (A)’. However, the speaker’s level of certainty about the result being ‘good’ will change slightly, depending on the particle.
ばいい - Hypothetically, (A) happening would be good. (Lowest strength/certainty)
たらいい - When (A) happens, it will be good. (Medium strength/certainty)
といい - The result of (A) is good. (Strongest/most certain)
To use , たら, or といい, first add the conjunction particle to the end of any verb, and then attach the い-Adjective, いい.
  • 明日(あした)までに届(とど)けばいいんだけど、多分(たぶん)届(とど)かないと思(おも)う
    It would be good if it gets delivered by tomorrow, but I don't think it will.
  • 私(わたし)もあんな早(はや)く走(はし)れたらいい
    It would be nice if I could also run that fast.
  • 来年(らいねん)は海外(かいがい)旅行(りょこう)行(い)けるといいね。
    It would be nice if we could travel abroad next year, right?
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日本語(にほんご)上手(じょうず)にしゃべれるようになりたかったら、日本人(にほんじん)としゃべったらいい
You should speak to Japanese people if you want to improve your Japanese conversational ability.
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毎日(まいにち)好(す)きな番組(ばんぐみ)が見(み)れたらいい
It would be nice if I could watch my favorite TV show everyday.
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自由(じゆう)にしたらいいでしょう。
It would be nice to just do whatever you want, wouldn't it?
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Books
Tobira
Page 122
みんなの日本語 II
Page 12 [CH 26]
みんなの日本語 II
Page 66 [CH 35]
Tae Kim's Japanese Grammar Guide
Page 139