Ah, it's a very loaded question because Korean grammar has many rules. However, the basics are... verb politeness suffix & name/addressing someone suffix Verbs: ㅂ니다 / 습니다 - very formal (there is an honorific above this using "시" but ignore for now) 어요/아요 - polite 다 - plain style 어/아 - informal Example of this, using 재미있다 - to be fun/interesting: 재미있습니다, 재미있어요, 재미있다, 재미있어 Name suffixes: -씨 Polite, acts as Mr/Miss -아/야 Used when calling someone's name rather than talking about them -님 Honorific used for someone higher than you (teacher = 선생님, CEO = 화장님)