By knowing the way how that person behaves with you and others. His company and his thoughts.
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well said Prakrit
The way a person speaksĀ his body language can determine a person and also if we talk with the person we can understand him in no time
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this is partially agreeable... cos,if it a stranger how can you watch him close?
we need not look in close we ca just have a glimpse we find something usual and unusal right by that we can describe it