1. 이 meaning : this (adjective) e.g. 이 가방은 누구 거예요? (Whose is this bag?) -polite ending form e.g. 이분이 누구세요? (Who is this person?) - honorific form 2. 이것 (pronoun) meaning : this one, this thing e.g. 이것 좀 보세요! (Look at this!) - polite ending form 3. 이것은 (pronoun + topic marker '은') e.g. 이것은 누구 거예요? (Whose is this thing?) * topic marker 은/ 는 is used when you are talking about something as a topic. After a final consonant of a syllable called 받침, '은' comes but after a vowel, ' 는' comes instead. ** '이것은' usually changes to '이건' in daily conversation. e.g. 이건 뭐예요? (What is this?)

안녕하세요~!^^ 이+noun - this something (this as adjective) ex) I like this color. 이것 this (one) - this (as a demonstrativpronomen) ex) I like this. 이것은 this ( 은 is a subjective particle here) This is my shirt. Hope it helps!