Alot of them can. But I am not sure if all can.
New Answer: Supposedly an EVP is a way to communicate with spirits. Researchers believe that the voices of the dead can be recorded and played back on magnetic audio tape. It is said this is the most modern way to communicate with the spirit world.
New Answer: No, because they don't exist and are a result of the human imagination
There is no definitive answer as ghosts are a supernatural concept and do not adhere to a specific language. In popular culture, ghostly communication is often portrayed as sounds or whispers rather than spoken language.
yess of couse! you just speak whaleee
because they are durka durkas
The same way they survive without bones
If in England, America, or anywere that speeks english. They did used to be humans, after all.
read the bible
In the Odyssey, he did not go into the Underworld but merely summoned ghosts of the dead to speak to him.
it is suggested that animals including cats can sense ghosts or spirits , because they are sensetive. however cats cant speak english and are unlikely to be able to talk to a ghost.
Some of the oldest stories known to mankind already speak of ghosts, souls and "higher beings". If your question had been "since when do people talk about (...)" the answer would probably be: since they can speak. Your question, however, is "since when do they KNOW". Not about stories, but actually know about ghosts and souls. The answer to that question is: not yet. The first person to prove knowledge is still entitled to the one million dollar that James Randi has offered.
In your imagination. No one has discovered any other reliable way. In fact, no one has yet shown proof that they exist.
Some say when you are in a theda state, in between wakefullness and sleep, they can speak with us and may be heard as voices in our heads
Ghosts can not have feelings as there are no ghosts in the world.