Belkys_2_I

                                             "I am glad you are here"
                                                          vs
(Sweet and Relieved Voice) "I am glad you here"
The first phrase "I am glad you are here" doesn't have any kind of direction of how the person should sound. The actor could express the phrase in a way the scriptwriter doesn't want him or her to express it. The second phrase has the direction of how the actor should sound, which t makes a big difference in the performance and development of the dialogue. The more details the writer provides about the mood, voice, gestures and behavior to the actors, the more accurate and effective the work will be.