I have a question about present perfect tense. It would be great if you could help me figure that out. Today I was listening to "Everything has changed" and I noticed that when I talk about something that is already started and affected to now or (a period around now), we always use present perfect, but what I do not understand is this part. I will write these sentences to compare.
I have changed my car.
I changed my car and now I am using a new car. the old car does not belong to me anymore.
Everything has changed
In this case I don't get it clearly. Actually I've heard this so many times, and I understand it. For example, when I talked to my friend about the computer game. The path was updated and there was everything new. And my friend said "Everything has changed".
I'm confused when I compare it to another sentence like
I have changed my mind.
I have changed my phone number.
I have changed my wallet.
but for "everything has changed" I think it could not be changed itself.
Why don't we say "Everything has been changed" instead because it does not have an object?