Phrases Phrases for Complaining Politely

I'm not sure I understand...

Meaning

Politely asking for clarification.

Translation language

John: The new regulations are quite complex.
Alice: Yes, they are. <b>I'm not sure I understand</b> section 3. Could you explain it to me?
John: Sure. Let me break it down. And <b>I'm not sure I understand</b> your previous point. Could you clarify?
Alice: Yes, of course! Let me rephrase.