〜ば〜のに (~ba ~noni) — if only ~, then ~

"If that had been so, this would have been" — imagining what didn't happen.

Formula (सूत्र ढाँचा)

Verb Vば + … + のに

い-adj い-adj [い] + ければ + … + のに

な-adj な-adj [だ] + なら + … + のに

N N + なら + … + のに

「〜ば〜のに」imagines something that did not happen and adds regret or complaint: 「若い時に始めればよかったのに」= you should have started when you were young.
The final のに adds "but that isn't how it went", which is what separates it from plain 「〜ば」.
Said to someone else it becomes a mild reproach: 「言ってくれればよかったのに」= you could have told me.

「〜たら〜のに」works the same way.

若い時に始めればよかったのに。

わかいときにはじめればよかったのに。

You should have started when you were young.

How it is built (कसरी बन्यो) 始める → ば-form 始めれば → attach よかった → adding のに at the end gives a complaint: 'but you didn't start'.

言ってくれればよかったのに。

いってくれればよかったのに。

You could have just told me.

How it is built (कसरी बन्यो) 言ってくれる → ば-form 言ってくれれば → よかった → のに → it gives a feeling of mild complaint.

もっと安ければ、買うのに。

もっとやすければ、かうのに。

If it were cheaper, I'd buy it.

How it is built (कसरी बन्यो) 安い → ば-form 安ければ → put 買う after it → adding のに gives the feeling 'but it's expensive'.

Question: 1/3

「早く来れば会えた＿。」— fill the blank.

💡 Hint: The "but it didn't" regret.