があるんだ

there is; have; there is a need to

→ が

phrase Rare #42,705

there is; have; there is a need to が marks what exists or is needed, and んだ adds an explanatory or emphatic tone. This form is informal.

JA: まだ確認する必要があるんだ。

EN: There’s still something we need to check.

You have work to do, after all.

— 東京物語 (1953)

There's somewhere to look. There's a sign.

— ブゴニア (2025)

We need to hurry.

— オッペンハイマー (2023)

が あるんだ