As I understand it, "I am been" is a sentence similar to "I am mistaken". How can one of the sentences in the two sentences of similar structure be incorrect? Doesn't "I am been" mean that someone is being me or perhaps someone was me? Is it incorrect just because it is not used for communication?
I guess, there can be one use of am been. Suppose, there were a robot which could transform itself into any human, say me. Now I will say:
I am been the robot.
Means that, I was being that robot.
I was told that the phrase "I am been something" means that something was being me which is incorrect, because no one can be me. But I created a hypothetical robot which can be me.
Many people have told me that am been can never be correct. I've seen phrases like "I am told", "I am fallen", "I am sick" etc. I don't understand why I am been is incorrect.
Please explain in simple English; I do not know grammar.