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

Struktur

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

Rincian

Standard

Tentang たらいい・といい

Bahasa Indonesia

Bahasa Jepang

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 with いい, first add the conjunction particle to the end of any verb, and then attach the い-Adjective, いい.

Antonim

Contoh

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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 – Diskusi Tata Bahasa

Balasan Terbaru (total 19)

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.
dharlequin
In the example

いつかまたどこかで会えたらいいね。

why is the ばいい form the only one that is considered to be invalid?
John-Bunpro
There are a lot of very good questions here, and I’m going to apologize in advance because it’s unlikely that I’m going to be able to address everything here in a single post.

First, let me link this Japanese explanation from a site for intermediate/advanced learners, as well as this one (from a site targeted at native Japanese-speaking teachers) for any who want to read through them, and I’ll go head and summarize/expand on upon some of the concepts covered.

One thing to note about ばいい in terms of nuance is that conditional ば itself places strong focus on the condition itself (in some cases going as far as to have an ‘if and only if’ nuance), as opposed to たら which has more of a feeling of presenting a hypothetical and then commenting on it.

Because of...