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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 a replacement part for a machine in your factory by this Friday. Your supplier says you'll get it by Monday.
You say, "Unfortunately, we really need the part by this Friday, because we have a large order that we need to fill. So, . . ."
Finish the above sentence.
-If you could send us the part by this Friday, we would really appreciate it.
-I'd be grateful if you could send us the part by this Friday.
-Do you think I could have the part by this Friday?