It depends on the person you use it with. They have different forms of formalities.
gamsahamnida and gomapseumnida are formal. You use these with strangers or people who are older than you.
gamsahaeyo and gomaweoyo are less formal.
gomapda is not formal, you use it only with friends or people younger than you.
2012년 5월 16일
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im a beginner in korean language , and i use kamsahamnida :)