First of all the bad news: there are two different types of passive
a) one is focussing on the process itself
b) one is focussing more on the result on the state of something.

The process passive is formed with a conjugated form of werden and the perfect participle of the verb.

present       ich werde gerufen I am called   du wirst gerufen you are called   er / sie / es wird gerufen he, she, it is called   wir werden gerufen we are called   ihr werdet gerufen you are called   sie werden gerufen they are called   Imperfect       ich wurde gerufen I was called   du wurdest gerufen you were called   er / sie / es wurde gerufen he, she, it was called   wir wurden gerufen we were called   ihr wurdet gerufen you were called   sie wurden gerufen they were called   Present perfect     ich bin gerufen worden I have been called   du bist gerufen worden you have been called   er / sie / es ist gerufen worden he, she, it has been called   wir sind gerufen worden we have been called   ihr seid gerufen worden you have been called   sie sind gerufen worden they have been called   Past perfect     ich war gerufen worden I had been called   du warst gerufen worden you had been called   er / sie / es war gerufen worden he, she, it had been called   wir waren gerufen worden we had been called   ihr wart gerufen worden you had been called   sie waren gerufen worden she had been called

Examples   Die Leute wurden gefangen genommen. The people were caught (and send to prison).   Das Auto war repariert worden. The car had been repaired.   Die Autos waren repariert worden. The cars had been repaired.   Die Maschine war überprüft worden. The machine had been checked.