I would like to finalised the document
I would like to finalise the document. (Present tense.)
I have finalised the document. OR
I finalised the document. (Past tense.)
i have been playing for three days.
That's correct (except that "I" is always capitalised).
I have been playing since three days.
Some British people would say this in their dialect but it would not be correct to write it in standard British English. We would say "I have been playing since three days ago." but usually only in the context of "I have only been playing since three days ago." It would still be more usual to say "I have been playing since Tuesday" or "I have only been playing for three days."
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