I don't understand, thoughAn informal contraction of 分からないんだけど. Often softens a statement or introduces a question, with the final んだけど sometimes left trailing: “I don't understand...” or “I don't know...”
JA: この問題の答えが分かんないんだけど、教えてくれる?
EN: I don't understand the answer to this problem—can you explain it to me?