You'[re] early, sport.

Well, if you are early then you have presumably arrived early, but I would not say that are 'means' have come.

Thank you, fivejedjon, for your very kind answer.
I thought "be" with a place adverb, thouhg my example doesn't have, means "hav

park sang joonFor instance, I think "I'm glad to be here" menas "I'm glad to have come."

No, it doesn't. Often it may be the case that the person has come, and that is why he is here, but "be" in itself does not mean that.

I'm in my study. I am very happy to be here. When I say that, I an not thinking at all of the fact that I did indeed come into this room some seven hours ago. I am also not thinking about the fact that I shall undoubtedly leave the room at some future time.

My desk is in my room. It did not really come into the room, though the wood from which I constructed it did.

I really do t

Thank you, GPY, for your very helpful answer.
Thank you, fivejedjon, for your continuing support.

BE as a linking verb has no meaning as such. Indeed, some languages manage without it.

I'm glad to be here - I'm glad that I am here - Mfeeling of gladness is a consequence of my presence here.