I think it has as it's formed according to the grammatical rules of the English language. It's also in a way necessary especially if it comes to the precision in meaning as well as differenciation between durative and non durative activities.
It's being done.
i don't know
I am being eaten!
i think it has a passive form because the correct form is : present progessive passive . we use is/are being + past participle
i think yes
In my opinion is yes because I think that in every verb tense uses to have or to be