Rainbow - since you've been gone.
Hello. I usually spend free time to listening pop music. And I sometimes feel strange in some lyrics..

The title is the one..
Fallowing what I've learned at high school, I can't use past present form but specific 'past time' after the word 'since'. But this song's title is "since you've been gone. It's strange to me..
And 'have been gone' is a passive form of 'have gone'? Is it possible? It's totally confussing.

Oh.. There are also many contents that write this song's title as 'since you been gone'. I think it's not grammatically strange But I guess this is not correct title. I heard this song many times and i cheched the vocal certainly sounds [you've].

Am I wrong? Is there something i don't know or I got wrong knowledge?

Question

Rainbow - since you've been gone.
Hello. I usually spend free time to listening pop music. And I sometimes feel strange in some lyrics..

The title is the one..
Fallowing what I've learned at high school, I can't use past present form but specific 'past time' after the word 'since'. But this song's title is "since you've been gone. It's strange to me..
And 'have been gone' is a passive form of 'have gone'? Is it possible? It's totally confussing.

Oh.. There are also many contents that write this song's title as 'since you been gone'. I think it's not grammatically strange But I guess this is not correct title. I heard this song many times and i cheched the vocal certainly sounds [you've].

Am I wrong? Is there something i don't know or I got wrong knowledge?

Answer

Every rule is made to be broken.  Usually, we would say "since you went away" (past simple).  However, that would make the listener think about the moment the person left.  The songwriter is much more interested in the feelings she experienced AFTER the person left.  You could express that in normal speech by saying "now that you are gone" (present tense of "be" with "gone" as an adjective).  However, that might sound like the person is not going to return, and that is not the meaning the songwriter wants.  Since the songwriter is more interested in feelings than grammar,   she uses tenses in a way that we usually wouldn't to better convey her precise feelings at a specific moment: she wants to show that her feelings changed AFTER the other person left, but she hopes he will return soon.  The strange use of tenses emphasizes the strangeness of the emotions she is feeling at this particular moment.

Answer

In this case, "gone" is not a verb or part of the verb.  It's an adjective modifying "you".  The verb is "have been" which is the present perfect tense of "to be".