당신 is a formal form of 'you' which should be used in special occasions. Normally to people you are addressing to with such a strong feelings. #1 It can be equated to "dear" in english when you address a person. Thus, it should be used only in certain social contexts (i.e., between married couples). Though "자기" is used nowadays. #2 when fighting or arguing ((insulting way) #3 in literary art -- lyrics and poem #4 used in public messages or advertisements If you use it to stranger it'll be kinda insulting and ironic. It's somehow a direct way of addressing a person which is somehow impolite in korean. Normally koreans would use the term 선생님 or the person's name instead of '당신' to refer/address a person unlike in english which is 'you'. another use of it that it can be an honorific third-person pronoun that can be used to address one's superior who is not present. 네가 is a combination of 너(you) + 가(subject particle). It's usually pronounced as 'niga' (니가). A subject particle is used to identify the person or thing that is being talked about in a sentence. Something like giving emphasis to the word in which it is attached to. 너 is 'you' korean, too, but an informal form(반말). It's usually used to people whom you are familiar with (i.e., family members but never with parents, your friends of the same status, classmates and the like). Never use it to people in higher social status. 나 is "I" -- a first person pronoun. You can use it to address yourself when talking to close friends of the same social status or younger than you, to close family members including parents. But you should not use it when talking to superior people like boses, teachers, etc. Use 저 instead, which is the humble form. 내가 is a combination of 나 + 가(subject particle). 나는 is a combination of 나 + 는 (topic particle). If you attach -는 in a sentence, it means that you are giving emphasis on that noun. Something like "As for this noun..." or "As for me..." 난,전 is basically the contracted form of

당신 is a formal form of 'you' which should be used in special occasions. Normally to people you are addressing to with such a strong feelings. #1 It can be equated to "dear" in english when you address a person. Thus, it should be used only in certain social contexts (i.e., between married couples). Though "자기" is used nowadays. #2 when fighting or arguing ((insulting way) #3 in literary art -- lyrics and poem #4 used in public messages or advertisements If you use it to stranger it'll be kinda insulting and ironic. It's somehow a direct way of addressing a person which is somehow impolite in korean. Normally koreans would use the term 선생님 or the person's name instead of '당신' to refer/address a person unlike in english which is 'you'. another use of it that it can be an honorific third-person pronoun that can be used to address one's superior who is not present. 네가 is a combination of 너(you) + 가(subject particle). It's usually pronounced as 'niga' (니가). A subject particle is used to identify the person or thing that is being talked about in a sentence. Something like giving emphasis to the word in which it is attached to. 너 is 'you' korean, too, but an informal form(반말). It's usually used to people whom you are familiar with (i.e., family members but never with parents, your friends of the same status, classmates and the like). Never use it to people in higher social status. 나 is "I" -- a first person pronoun. You can use it to address yourself when talking to close friends of the same social status or younger than you, to close family members including parents. But you should not use it when talking to superior people like boses, teachers, etc. Use 저 instead, which is the humble form. 내가 is a combination of 나 + 가(subject particle). 나는 is a combination of 나 + 는 (topic particle). If you attach -는 in a sentence, it means that you are giving emphasis on that noun. Something like "As for this noun..." or "As for me..." 난,전 is basically the contracted form of