Two essential conversation skills: politely signalling that you didn't catch something, and asking for a clearer explanation. Plus a small section on expressing requests.
Use one of these phrases when you didn't catch what someone said:
When you understand the words but not the meaning, use:
Could you …, please?
Would you mind + V-ing?
Can I ask you to …?
I was wondering if you could …
Do you think you could …?
Accepting: Sure / Of course / Certainly / No problem / With pleasure.
Declining: I'm afraid I can't / I'd love to but … / Sorry, I'm busy right now / Sorry, I'd rather not.
Lack of understanding = "I didn't hear / I didn't get it." vs Clarification = "I heard but I don't understand the meaning."
Add "please", "sorry", "could you". Direct phrases sound rude.
Polite opening + the request + a reason. "Could you help me with this exercise, please? I really don't understand it."
The National Exam often gives a dialogue with instructions in brackets, e.g. (complain about the bed) or (ask for clarification). Always start with a polite phrase and add a justifying detail.