How do you say Good Morning, Good Evening and Good Afternoon in Korean?

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Answer

Good morning ; 
안녕히 주무셨어요?(honorific) Did you sleep soundly? 
잘 잤어요?(respectful) Did you sleep well?
잘 잤어?(casual)

"Good afternoon/evening" doesn't exist in Korean.

Hmm...as for 좋은 아침입니다, it's rarely used in daily conversation, I'd say. It's something you hear from TV or radio.

Answer

Ｔｈａｎｋｓ　ｅｖｅｒｙｏｎｅ～

Answer

We don't tell them in a different way. 

Just one expression will be enough,which is "안녕하세요.", 
but for "good morning", '좋은(good)아침(morning) 입니다' is often used.

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