Except for specialized briefings, a speaker should not be static. Movement, as well as gestures, is vital to maintaining speaker and audience enthusiasm for the presentation. If you move about on the stage, make your movements purposeful. Use your movement to reinforce or emphasize a point. If this is true, it heightens the importance of this most difficult element of speech delivery effective articulation and voice modulation.
People tend to judge speakers based on the their ability to pronounce words correctly and clearly.
Unfortunately, this is not something that can be taught in three easy lessons. In the long term you need to acquaint yourself with the correct method of using a dictionary to facilitate proper pronunciation. This will communicate your interest and excitement for your topic and help generate audience interest, too. Exaggerate voice inflection. Inflection in conversational speaking is difficult to detect when you are speaking in front of an audience.