doseogwanmada chaegi manhayo.

Every library has many books.

Breakdown of doseogwanmada chaegi manhayo.

• ~이: subject particle
• 책: book
• 도서관: library
• 많다: many
• ~마다: distributive particle

Questions & Answers about doseogwanmada chaegi manhayo.

What does 마다 mean in 도서관마다?

마다 is a postposition meaning “each” or “every.” When attached to 도서관, 도서관마다 literally means “every library” or “each library.”

How is 도서관마다 different from 모든 도서관에?

Both can convey “all libraries,” but:

• 마다 emphasizes distribution across individual units (“in every single library”).
• 모든 도서관에 (literally “in all libraries”) is more general.
  In practice, 도서관마다 sounds more natural when you want to stress “each and every library.”

Why is 책 marked with 이 in 책이 많아요?

이 is the subject particle used after a noun ending in a consonant. It marks 책 as the subject of the predicate 많아요 (“are many”).

Why use the adjective 많다 here instead of the verb 있다?

• 많다 means “to be many” and describes quantity.
• 있다 means “to exist” or “to have.”
  While 책이 있어요 would mean “there are books,” 책이 많아요 specifically emphasizes that there are many books.

Could we say 도서관마다 많은 책이 있어요 instead?

Yes. That sentence uses 많은 (the attributive form of 많다) to modify 책 and 있어요 to state existence. The meaning and nuance are almost the same: “There are many books in every library.”

Why is the ending -아요 (많아요) used instead of the formal -습니다 (많습니다)?

-아요/어요 (해요체) is polite but informal, common in everyday conversation or writing among peers.
-습니다 (합쇼체) is polite formal, used in official speeches, announcements, or formal writing. The choice depends on the level of formality you wish to convey.