Pause before responding.
I don't know about you, but I'm often in a rush for something and whenever I'm trying to communicate, I'm usually trying to do so quickly. As hard as it is for me to just pause sometimes, I've actually found that it works wonders when it comes to communicating more effectively with others. Sometimes just that tiny break, giving you time to think, is just what you need to really understand what someone else has said or to formulate the thoughts you really want to convey.