Question 1

What is the function of the particle 은 in 이 책은 예뻐요?

Accepted Answer

은 is the topic marker. It highlights 이 책 as the topic of the sentence, carrying the nuance “As for this book…” and setting it up for the comment that follows.

Question 2

Why is the particle shown in brackets?

Accepted Answer

Brackets indicate that the particle is optional. In spoken or informal Korean, if context is clear, you can drop 은 and still say 이 책 예뻐요. Including 은 simply adds clarity or emphasis.

Question 3

What’s the difference between using 은 and 이 in this sentence?

Accepted Answer

- 은 marks the topic: “As for this book…”  
- 이 marks the subject: “This book [performs the action or has the property].”  
Using 이 책이 예뻐요 treats the book as the subject (often for new information), while 이 책은 예뻐요 treats it as the topic (often for known or contrasted information).

Question 4

Why is 예뻐요 spelled like that instead of 예쁘어요?

Accepted Answer

When an adjective ends in -으다 (here 예쁘다), you drop the 으 before attaching -아요/-어요. So:  
예쁘다 → stem 예쁘- → drop 으 → 예쁘 → add -어요 → 예뻐요.

Question 5

Is 예쁘다 an irregular adjective?

Accepted Answer

Yes. It belongs to the ㅡ-irregular group. For these words, you always remove the ㅡ in the final syllable of the stem before adding -아/-어요, then choose 아 or 어 based on the preceding vowel. In 예쁘다, you drop 으 and add 어, giving 예뻐요.

Question 6

Could I also say 이 책이 예뻐요? What’s the nuance?

Accepted Answer

Yes—이 책이 예뻐요 is grammatically correct.  
• 이 책이 예뻐요 presents “this book” as the subject, often introducing new info or simply stating a fact.  
• 이 책은 예뻐요 presents it as the topic, often implying contrast (e.g., compared to other books) or emphasizing “as for this one…”.

i chaekeun yeppeoyo.

Breakdown of i chaekeun yeppeoyo.

Questions & Answers about i chaekeun yeppeoyo.

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Master Korean — from i chaekeun yeppeoyo to fluency