Thread:Tariq Jabbar/@comment-24808864-20141024214723/@comment-25501845-20141025141127

Actually Tibet, the Sentence you have wrote "Barrack Obama had been President by citizen voted since 2008". is not a Present perfect continuous tense. It is Past perfect continuous Tense ;)

Here is an Example os Present perfect continuous :- I have been a member of Khan academy since 2013.

And about Past perfect.

FORM
[has/have + past participle] Examples: 
 * You have seen that movie many times.
 * Have you seen that movie many times?
 * You have not seen that movie many times.