<Requesting>
Would you mind 〜ing ...? Would you ...? は、Formal
Could you ...? Will you ...? Please ...? は、Neutral
Can you ..? は、Informal
※ Specific case: Could you please ...? Would you please ...? is more polite.
<Answering>
"Sure./Yes./OK." for Could you ...? Would you ...?
条件をつけるときは、I could if you .... のように答える。
※ When refusing, it is polite to apologize and give a reason.
I'm sorry, but I ....
× "No, I can't." is quite rude !
*** Would you mind ...? requests ***
"Yes, I do (mind)." means refusing.
"No, not at all./No, I don't (mind)." means acceptance.
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