Learn Hardcore Korean: i jibeun keoyo.

은 is the topic marker you attach to a noun that ends in a consonant. It’s like saying “as for …” in English. Here, 이 집은 means “as for this house,” introducing it as the topic of your sentence.

Why is 은 used instead of 는 after 집?

The topic particle comes in two forms: 은 after a consonant-ending noun and 는 after a vowel-ending noun. Since 집 ends with the consonant ㅂ, we use 은. If you had a noun like 나무 (tree), it would be 나무는.

What’s the difference between the topic marker 은/는 and the subject marker 이/가?

은/는 (topic) frames what the sentence is about, often implying contrast or known information.
이/가 (subject) marks the subject performing an action or possessing a quality, often introducing new information.
In practice, 이 집은 커요 (“As for this house, it’s big”) presents the house as known or contrasted with something else, whereas 이 집이 커요 more neutrally states “This house is big,” perhaps answering “Which one is big?”

Why isn’t there a separate verb for “is” in 이 집은 커요?

In Korean, descriptive verbs (often called adjectives in English) double as predicates. is the dictionary form meaning “to be big.” When you conjugate it into polite present tense, it becomes . You don’t need an extra “to be” verb like English uses.