chaegeul cheoncheonhi ilgeoyo.

I read the book slowly.

Breakdown of chaegeul cheoncheonhi ilgeoyo.

• 읽다: to read
• ~을: object particle
• 책: book
• 천천히: slowly

Questions & Answers about chaegeul cheoncheonhi ilgeoyo.

What is the function of 을 in 책을?

을 is the object particle. It marks 책 (“book”) as the direct object of the verb 읽어요 (“read”).

Why is 천천히 placed before the verb 읽어요?

천천히 is an adverb meaning “slowly.” In Korean, adverbs typically come right before the verb they modify, so 천천히 읽어요 means “read slowly.”

What part of speech is 천천히, and how is it formed?

천천히 is an adverb of manner. It comes from the adjective 천천하다 (to be slow), with -이 added to turn it into an adverb.

What does the ending -어요 in 읽어요 indicate?

-어요 is the present-tense polite ending in the standard speech level. It makes the sentence polite but not overly formal.

How would this sentence change in a more formal setting?

You would use the formal polite ending -습니다:
책을 천천히 읽습니다.

Can you drop the particle 을 and still be understood?

Yes. In casual or everyday speech, Koreans often omit object particles when the context is clear:
책 천천히 읽어요.
However, including 을 is more grammatically complete.

How do you turn this statement into a request to someone (“Please read the book slowly”)?

Add -어/아 주세요 to make a polite request:
책을 천천히 읽어 주세요.