Breakdown of doseogwaneun joyonghaeseo jipjungi jal dwaeyo.
Questions & Answers about doseogwaneun joyonghaeseo jipjungi jal dwaeyo.
은/는 marks the topic of the sentence, so 도서관은 means something like as for the library or when it comes to the library.
In this sentence, the speaker is making a general comment about the library:
- 도서관은 조용해서... = The library is quiet, so...
If you used 도서관이, it would sound more like you are specifically identifying the library as the thing that is quiet, often in contrast to something else. Both can be grammatical in the right context, but 은/는 is very natural here for a general statement.
조용해서 comes from 조용하다 (to be quiet).
It is formed like this:
- 조용하-
- -아서/어서 → 조용해서
Here, -아서/어서 means because or and so. So:
- 조용해서 = because it is quiet
This grammar connects the first part of the sentence to the result in the second part:
- 도서관은 조용해서 집중이 잘 돼요.
- Because the library is quiet, concentration goes well.