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Your voice is also capable of revealing your emotions. A quiver in your voice or jumping to another octave while speaking is an easy tell for your opponents. Clear your throat or take a full breath before speaking so that you have enough air to talk in a neutral register. Stick to the facts of what's happening and you won't need too many words. Stumbling over your sentences, stuttering, or saying "um" too many times shows that you are nervous or unsure of yourself. Short, sweet, and to the point is how you should talk when in high-stress situations. One-word answers are acceptable, especially in high-stakes games like poker. You need to concentrate more on the game anyways rather than shooting the breeze with your opponents. If you're playing a game with friends and there isn't real money at stake, the atmosphere may be a little more relaxed so talking may more appropriate. Just watch yourself when examining your hand. When asked a question by the dealer or someone else, it's acceptable to simply answer "yes" or "no" by nodding or shaking your head. If you don't feel comfortable opening your mouth because you're afraid that your voice will give you away, simply use relaxed body language to convey your answer. To distract yourself and keep from speaking, chew gum or keep snacks at the table. It helps to think about what you want to say before you speak. That way you can keep yourself from sounding excited or disappointed. To be completely counter-intuitive, instead of staying silent you can comment on every hand dealt or result. You can pepper in false reactions too to throw your opponents off. Constantly talking can also distract your opponents by diverting their attention from the game to whatever you're saying. Bluffing is an important part of poker. For example, you can receive a bad hand and pretend like you just got a winning hand. If you're consistently inconsistent with your reactions, no one will be able to guess your true reactions. This is much harder to do but can work in your favor.
Speak with an even and balanced tone. Keep your words few and simple. Nod your head if you aren't comfortable speaking. Confuse your opponents by talking constantly.