Why obviously we do not understand but still have to nod? Because we want the other to know that we actually had carefully listen to you talking on the surface, as is still some slack to really understand the questionable.
Why do we clearly understand but still nod? On the surface is because we want to let the other side know that we are actually listening to you carefully, as to whether it is really understanding or casual perfunctory is open to discussion.
Why do we nod our heads when we don't understand? On the surface, it's because we want the other party to know that we are actually listening to you. It's questionable whether we really understand or perfunctory<br>