Why do people cover their mouth when they burp or yawn but not when they talk or laugh?
When you talk I can still smell your breath, also you sometimes spit when you talk and with laughing it's possible to laugh with your mouth wide open so therefore I can still see inside your mouth.
by 
Je'sean
ANSWERS: 2
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they probably didnt think of it
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The same reason people point to their wrist when they want to ask for the time, but not to their crotch when asking for directions to the toilet. The phrase you have not learned is "learned behaviour". It's what 90% of adult behaviour consists of.
pearllederman 
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