といいIt would be nice if, It would be good if, Should, I hope

Structure

Verb［たら］+ いい
Verb［ば］+ いい
Verb + と + いい

［い］Adjective［た］+ ら+ いい
［い］Adjective［い］+ ければ+ いい
［い］Adjective + と + いい

［な］Adjective + だった + ら+ いい
［な］Adjective + であれば+ いい
［な］Adjective + だ + といい

Details

About たらいい・といい

When any of the conjunction particles that carry the meaning of 'if' (たら, ば, or と) 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 ば, 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.

Synonyms

Antonyms

ないほうがいい
It'd be better not to, Shouldn't do
Not studied yet

Examples

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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.

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?

明日(あした)と明後日(あさって)も晴(は)れるといいですね。

It would be nice if the weather was clear tomorrow and the day after, wouldn't it?

文句(もんく)を言(い)わないで！どうしたらいいのか教(おし)えてよ。

Stop complaining! Tell me what would be good to do!

僕(ぼく)もイルカみたいに上手(じょうず)に泳(およ)げたらいいのに。

I wish I could swim well like a dolphin. (it would be good if...)

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たらいい・といい – Grammar Discussion

Most Recent Replies (17 in total)

RadicalC
Thank you, so it can never mean after/when when used with this grammar? in the たら variant
Vl3x0083
Ok, so in the practice sentences you get while cramming, what determines whether ばいい is a valid answer or not? Because there doesn’t seem to be any rhyme or reason to it that I can figure out. The lesson description sounds nice with

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)

but it seems like that immediately goes out the window.

ex.

毎日、好きな番組が見れたらいいです。(見れる)
毎日、好きな番組が見れるといいです。
毎日、好きな番組が見れればいいです。
自由にしたらいいでしょう。(する)
自由にするといいでしょう。
自由にすればいいでしょう。

all valid

明日と明後日も晴れたらいいですね。(晴れる)
明日と明後日も晴れるといいですね。
いつかまたどこかで会えたらいいね。(会える)
いつかまたどこかで会えるといいね。
どの道を行ったらいいのかもっと詳しく教えてください。(行く)
どの道を行くといいのかもっと詳しく教えてください。

only たらいい and といい are valid

辛すぎて、何を言ったらいいか...
casual
Hmm, difficult.

This one seems to fall under “asking for directions” usage, so I’d expect it to be allowed

どの道を行けばいいのかもっと詳しく教えてください。

This one seems to match the allowed usage from Caution section of ばいい (JLPT N3) | Bunpro

僕もイルカみたいに上手に泳げればいいのに。

As for a possible pattern, 【35課】教案：条件形、Nなら（話題） - 日本語教師のN1et (section 条件(と・ば・たら・なら)の基礎知識) separates ば usages for regular/constant situations and for conditional situations, with the latter having a few restrictions on usage. Could be related to that.