When a speaker or presenter leaves out a sound or a syllable, they are guilty of omissions. Otherwise known as deletions, these speech mistakes can cause the speaker to sound uneducated or unprofessional. Often, these deletions are a type of regionalism and frequently, the presenter has no idea that they omit certain sounds. I was recently asked to coach someone because her regional speech patterns were impacting her executive presence and opportunities for advancement. We discovered that omissions were one of her issues. Listen to the video to see if you're guilty of using any of these deletions.