1. Excuse me?
2. Pardon me?
3. I’m sorry?
4. Sorry. I missed that.
missed that= failed to hear what was said.
5. I didn’t get that.
to get that= to hear or understand what was said.
6. What was that?
7. What did you say?
8. Could you repeat that, please?
9. What?
10. Huh? = 9番と10番はinformalな聞き方になります。
かなり親しい間柄でしたら使っても問題ありません。
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By Yoko