Below are a few tools to increase your comfort with silence and to incorporate it properly into your communication.
Record yourself… and listen to it. I know, you hate listening to the sound of your own voice. You are expecting other people to listen to you, right? You need to hear what they hear. Listen to a recording of yourself. Where do you sound fast? Where do you sound slow? Where do you naturally catch your breath? Count the sentences you hear in the talk. As a listener, do you hear punctuation?
Breathe and pause much longer than normal while practicing your delivery. While practicing, force yourself to pause and take a deep breath between each and every sentence. This style would be overkill for presentation day, but it will get you into the habit of breathing in the right place and collecting your own thoughts in silence.
Program your talk with planned pauses. Let’s face it. When you get on stage with your adrenaline rushing, some of this practice may fly out the window and your pace may pick up. Set yourself, and your audience, up for a positive experience by inserting planned breathing breaks into your talk. Look for spots in between slides, after a particularly important or complicated point, or after a powerful emotional statement. This way, if you do speed up, you will have a chance to regain your breath and pace, and your audience will have a chance to process and catch up to you.