Hello, Meharaj Mohammed—and welcome to English Forums. Thank you for registering as a member. Meharaj Mohammed Can you please send me the following invoices.
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Meharaj MohammedCan you please send me the following invoices.Your sentence is fine, but 'could' is more polite than 'can'.
bartoszdebskiIt's a question, he should use a question mark at the end.That's a comma splice; you should use a semicolon after 'question'. https://en.wikipedia.org/wiki/Comma_splice]
bartoszdebskiIt's a question; he should use a question mark at the end.It is often omitted, as such a request is stronger than a question; it is a mild command. Adding the question mark may weaken the request overmuch.