有一些現在完成式問題想問問

(1)I have written( 5 letters) for a duration lasting 2 hours.
(2)I have already written( 5 letters) for a period of 2 hours.
(3)I have been written( 5 letters) since 9 am.

2015-03-24 22:37:59 補充：
How many letters have you written, 5 or 10 ?

2015-03-25 09:14:09 補充：
Error&corrections:-5 letters.

2015-04-08 21:16:03 補充：
5 or 10 letters?

可以呀, 文法無問題 ~~ 但.........

你係寫左5封信, 定係10封信呀????