いいのだが

I wish …

→ 良い
phrase Uncommon #8,316
I wish … Expresses a wish about a situation that is not true or may not happen. The ending だが adds a sense of “but” and can leave the thought hanging.
JA: もっと休みがあればいいのだが。
EN: I wish I had more time off.

彼の住所を知っていればいいのだが。

I wish I knew his address.

僕は君くらい利口だといいのだが。

I wish I were as smart as you.

英語が話せたらいいのだが。

I wish I could speak English.