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One of the telltale signs of laryngitis is hoarseness, which refers to the raspy, strained quality your voice gets when you’ve used it too much.  To make your voice sound raspy and gravelly, practice vibrating your vocal chords like you're croaking like a frog.  Also practice making bah noises like you're a sheep, because this will also vibrate your vocal chords. After practicing making sounds, start incorporating that same raspy quality into your speaking voice. Another common thing that happens when you have laryngitis is that you'll experience unintentional changes in the volume and pitch of your voice as you speak. When you're speaking, try to make your voice crack as you say certain words, and then make your voice fade out briefly so it’s quieter than usual. Alternate between doing this and speaking in your regular (but hoarse) voice. In addition to the voice cracking and fading, you should also whisper more when you speak if you want to fake losing your voice. When you have laryngitis, your vocal chords will often have trouble producing sound, and you can replicate this by dropping your voice to a strained whisper intermittently as you speak.  Make sure you continue alternating between your voice cracking, fading, whispering, and speaking hoarsely at a normal volume. When you transition between these different voice effects, try to make the transition as natural as possible so people don’t know you're forcing it. Laryngitis often causes a rawness in the throat and a dry throat, so it’s common for people who’ve lost their voice to cough sometimes when they speak.  Don’t cough too much, but throw in a few dry coughs if you’ve been talking for a while. A cough is created when your body forcefully expels air from the lungs, which is different from vibrating your vocal chords to create speech, meaning you can still cough if you’ve lost your voice.
Sound hoarse. Make your voice crack and fade. Throw in some strained whispering when you speak. Cough when you talk.