ばいい
Structure
Verb[ ば ] + いい
Explanation
[Used to ask for/give emphatic advice/express good option. Common phrase: どうすればいい - what should ~ do/how do ~/ how can ~]
[Used to ask for/give emphatic advice/express good option/wishes(often with なあ). Also, can be used together with のに to express an advice/wish that regretfully differs from actual state/is impossible to realize. ]
Is there anything wrong with 出ていくべきなんでしょう rather than 出ていけばいいんでしょう?
It’s the strength of the advice; empathetic suggestion vs. obligation
違いを理解するために、再び文法ポイントの「ばいい」と「べき」を読み直せばいいです。
In order to understand the differences, it would be a good idea to re-read the grammar points for ‘ba ii’ and ‘beki’ again.
違いを理解するために、再び文法ポイントの「ばいい」と「べき」を読み直すべきです。
In order to understand the differences, you should re-read the grammar points for ‘ba ii’ and ‘beki’ again.
I think といいです grammar could work as well with a slightly different nuance as well. Then there is たらいい、てもいい and ほうがいい. I think these get a bit more confusing on nuance compared to above.
Should there be a notation for よい? Came across that while reading Harry Potter. Threw me off for a bit, haha.
What’s the main difference between this and といい and -たらいい?
They seem very similar, but it won’t take them as the right answer for ones where it wants the other one.
@DarkConfidant
Hey 
They are generally interchangeable with small differences being that たらいい feels a bit more casual than といい (and ばいい）and といい cannot be used in questions, while both ばいい and たらいい can, so どうしたらいい and どうすればいい are OK while どうするといい？ is not.
Another thing, when といい is used when giving recommendation/advice it might have a slight nuance of the action advised might generally be recommended thing to do.
Other than that they should be interchangeable (in giving advice (though it adds mentioned nuance), also in all cases where one wishes or wonders with といいんだけど and so on), and if they are not accepted than its an error on our side and I’ll fix it (will check all of the sentences one by one).
I hope it helps,
Cheers
Saw this example on the website
行ければいいけど、行けるかわからない
Why is it 行ければ and not 行けば？
Hey @AlexoRush !
行ければ is 行く conjugated using these grammar points, れる・られる (Potential) and ば.
行ければいい means ‘it would be good if I can go’.
行けばいい means ‘it would be good if I go’.
I hope this helps!
In the example sentence
僕がでていけばいいんでしょう。悪いのは僕の方なんだから。(meaning It would be better if I leave, right? Since I am the one who has done wrong.)
I was curious as to what the function of な is within 方なんだから? It intuitively sounds natural to my ears, but I often get tripped up whenever I see a なん every once in a while, so I’d appreciate an explanation from someone who understands! Thank you!
Isn’t it just ～んです・のです (JLPT N5) | Bunpro, with な being necessary to link a noun 方.
A simple point blank statement:
悪いのは僕の方だ。
With conviction/explanatory nuance:
悪いのは僕の方なんだ。
悪いのは僕の方なのです。
With conviction, and explicitly giving a reason for the previous sentence:
悪いのは僕の方なんだから。
More plainly giving a reason:
悪いのは僕の方だから。
I seems like both だから and のだから versions are used plenty. Apologies if you were looking for something more specific!
No that was a great explanation and breakdown, thank you! Sometimes I definitely overthink things haha.