Is changed or Has changed?

I got stumped by a student this morning:oops: Is it correct to say:

"The situation has changed" or
"The situation is changed"?

Another example: I redecorated my room. It was yellow but is now green.

Do I say "the room has changed" or the "the room is changed"?

And why:?:

Thanks in advance:-D

Quote:

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Originally Posted by Dolbo

I got stumped by a student this morning:oops: Is it correct to say:

"The situation has changed" or
"The situation is changed"?

Another example: I redecorated my room. It was yellow but is now green.

Do I say "the room has changed" or the "the room is changed"?

And why:?:

Thanks in advance:-D

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The situation has changed, it is now a changed situation.
The room has changed, it is now a changed room.
Does that help?