"Could have been" is used to describe something that did not happen, but which was possible to have happened. It specifically says the thing was not impossible.
"He could have been a champion" means that he was not a champion, that something intervened to prevent it, and if that intervention had not happened, he might have been a champion.
"If the house had not burned down, it could have been my home for the rest of my life."
"That ice cream that just fell on the floor could have been a treat for Johnny when he got home."
yes. I have been to a reef.
Example sentence - If they would have been considerate of their hosts and not self-invited, accommodations could have been plentifully dispersed.
A good sentence could be: Does she have her hair colored? Yes, she has had a dye job. I have to go to the store, she has not been there yet.
We listed every state we've been to for our homework assignment
The correct sentence would be "He could not have been there". This is because 'can' is in the present tense and doesn't agree with the rest of the sentence.
Been is the past tense of the verb to be: I have been to the library. The term "of been" is not a correct phrase in English. Unfortunately, many people use it instead of "have been". For example, "I could of been an athlete." is incorrect; "I could have been an athlete." is the correct term.
you could put dinosaurs are an extinction.
An answer to those questions has been found.
i hate that word, likewise, i use it in this sentence
"Under different circumstance's, the war could have been avioded," said the townsfolk.
They could see where the mouse had been gnawing on the piece of wood by the marks that were on it.
Yes, had and had are correct. You could drop the first 'hand' and still have a good sentence. BUT who is "They"? and who is "her"? That makes the sentence confusing. You could change it to: Cathy's parents had just arrived, but her husband had been staying nearby for a while.