NOUN 은/는

NOUN 은/는 

GRAMMAR FOCUS
1. 은/는 designates the topic, or the target of exposition, of a particular sentence or group of sentence. In English " as for' or "regarding". For words ending vowel , 는 is added, and for words ending in a consonants, 은 is added.
2.은/는 is also used when referring to something mentioned earlier in a conversation or when talking about something already known by both sides in the conversation.In other word , 은/는 is used when expressing "old" information.
3. 은/는 is used when comparing or contrasting two things, and , in such cases, it can be attached not only to subjects but also the objects or other parts of the sentence.