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You can tell when someone is sad because their mouth turns down and they may cry. They could also have a defeated body posture.

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Happiness is most often seen with a smile.  In addition you could notice that someone is jumping up and down, clapping, or using their hands in an excited gesture.

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Confusion is sometimes paired with the actions of scratching your head, looking up, and sometimes even looking uncomfortable.

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Boredom can often times be paired with a sigh, poor body posture and language, and sometimes can be mistaken for sleepiness.

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Anger is one of the most universal non verbal cues. When most people are angry they exhibit things such as rigid posture, closed fists, and sometimes even have downward facing eyebrows.