ができたらいいのに

I wish I could

→ が
phrase Rare #26,608
I wish I could Expresses a wish or longing that the speaker could do something. The pattern is [noun or verb phrase]ができたらいいのに. It can also mean “It would be nice if I could...” and often conveys mild regret or disappointment.
JA: もっと日本語で話ができたらいいのに。
EN: I wish I could speak more Japanese.

私も英語ができたらいいのに

I wish I could speak English too.

ができたらいいのに

I wish we could talk.

— ベルリン・天使の詩 (1987)

僕も日本語ができたらいいのに

I wish I could speak Japanese too.

僕も英語ができたらいいのに

I wish I could speak English too.