What are copula and isthis sentence correct: I am changed

[Hamids]

What are copula and isthis sentence correct : I am changed

[Torsten]

What exactly do you want to say? The sentence I'm changed is grammatically correct but doesn't make much sense without any further context.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Hamids]

Context:
ONe person having been in jail for some time sayus I am changed to refer to his changed ways.

[Torsten]

What about "I've changed my ways"?
_________________
Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Hamids]

That (I've changed ) wan in my mind too, but this ( I'm changed) felt a little odd to listen.
So i thought of verifying it's correctness. You said about the sentence being grammatically correct .
Thanks
But my other question remains unanswered. Could you explain on copula.
context:

as Found in some dictionary
copula, used with an adjective or a predicate noun