Do you know where the Post Office is?

你知道邮局在哪里吗？

Can you tell me where the post office is?

您能告诉我邮电局怎么走吗？

B. Can you tell me where the post office is?

你可以告诉我邮局在哪里吗？

Would you kindly tell me where the post office is?

可不可以告诉我邮局在哪里？