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Happiness is usually very easy to tell because of the ear to ear smiling or the laughter echoing across the room. Wide eyes, large body movements such as jumping, spinning and dancing show that someone is feeling very happy.  Each time one of my students sees her dad at dismissal she begins to smile, jump up and down and scream, " there is my dad!" to show her happiness and excitement to see him.
One point I wanted to mention,however, was that even though someone is smiling on the outside, it does not always mean they are happy on the inside. Sometimes people feel they need to be brave and put on a smile so others do not worry or know they are sad inside.

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Confusion can be shown by the shrugging of shoulders or scratching of the head. They can sometimes tilt their head and squint their eyes. They will even just stare at the board or in their book and not speak because they are confused. All of these non verbal cues help the teacher or anyone else who is communicating with the person to know they are confused.

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It is easily noticed when someone is sad. Just today, after school I noticed one of my previous students sitting alone. I knew immediately that was sad and when I asked if she was ok, she broke down and started crying. I knew she was sad because she displayed a frown on her face and was sulking. Her head was looking down and then there were tears. I knew right away something was wrong and she was sad simply because of her facial expressions and body language

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Some individuals tend to have no problem showing they are bored. My students, sometimes, have no shame in hiding they are bored.  They look as though they are staring into space.  Sometimes resting their face on their hand.  They neither look pleased or angry.  Body language is very slouched, not sitting upright.

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People tend to show that they are angry through their body language and facial expressions.  An individual can cross their arms across their chest as pictured.  Sometimes, they will scrunch their nose and eyes to show anger through their facial expressions.  Faces can become very red when anger is present.  Sometimes veins can even become present on their face.