問問現在完成式既問題

Present perfect Tense（現在完成式）
The present perfect is formed by combining the auxiliary verb with the past participle.
e.g.He has written a letter to María.
We have been stranded for six days.
Because the present perfect is a compound tense, two verbs are required: the main verb and the auxiliary verb.
He has written a letter to María.
(main verb: written ; auxiliary verb: has)
We have been stranded for six days.
(main verb: been ; auxiliary verb: have)
由於你在3月3日離開ABC Hospital.
你對朋友講你已經離開了醫院，應該用現代完成式:
I have been discharged from ABC Hospital.
to discharge me 的意思是允許我出院
我被允許出院是：I have been discharged.

present perfect=no stated time;past tense=if stated time (=Mar3,2010.)
For the phrase:-
send self away;
allow self to leave;
to discharge self from ABC Hospital.

The discharge of Karen from ABC Hospital was dated Mar3,2010.
No Problem;

After her discharge,she used past tense to replace present