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Would you please do me a favor to...?
您能够帮我一个……忙好吗?
Would you please do me a favor, sir?
您能够帮我一个忙吗，先生?
Would you please do me a favor to open the window?
您能够帮我打开窗户吗?
A:I can't solve this math problem, would you please do me a favor ?
我解不开这道数学题，您能够帮我一下吗?
B:Sorry, I'm not good at math, you can go to John for help.
对不起，我不擅长数学，你可以找约翰帮忙。