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If you are asking for something, you can say "Can you. . .please?" or, more formally, "Could you. . . .please?
However, formal business emails can be even more polite than that, especially if the request is larger or more complicated.
For example: You need information re. a writer's share by this Friday.
You say, "Unfortunately, we really need this information by this Friday, because we have to correct the registration. So, we would appreciate if . . ."
Finish the above sentence.
...you could send us this information by Friday.