You might get a clear voice, or the words might just materialize in your mind. Sometimes they really insist on speaking a foreign language so verbal communication will have limited use. An entity might also answer in pictures. That can give just as much information, but might be a little unfamiliar. You can usually still talk to the entity in words and it will present a picture to you as an answer or response to what you are saying.
Feelings can also be a method.
As a matter of fact, just about all entities communicate fine with feelings. The problem might be that our client isn't very much in touch with feelings and might not notice. Usually the feelings will be in the person's body, but they might also be external kinesthetic information. If only feelings are available it necessitates fairly simplistic communication without any abstract concepts. Sometimes entities are not willing to communicate consciously with the person.