Learn Hardcore Korean: gongwoni sikdangboda deo keoyo. - The park is bigger than the restaurant.

공원 means “park.”
The particle -이/가 marks 공원 as the subject of the sentence (the thing being described).
Korean also has a topic marker -은/는, but here -이/가 simply focuses on the park as the new or specific subject.

What does the particle -보다 in 식당보다 mean?

보다 means “than” when making comparisons.
식당보다 literally means “than the restaurant,” setting up the second item in the comparison.

Why do we use 더 if -보다 already marks the comparison?

보다 only marks the “than” part (the item you’re comparing to).
더 means “more,” and it’s required to form the comparative adjective “more big” → “bigger.”
Together: 식당보다 더 크다 = “to be more big than the restaurant.”

Why is 크다 conjugated as 커요?

In polite speech, you add -아요 or -어요 to the verb/adjective stem.
크다 has the stem 크-. Adding -아요 gives 크아요, but due to vowel contraction (크 + 아 → 커), it becomes 커요.

Why isn’t there a verb like “is” in 공원이 식당보다 더 커요?

In Korean, descriptive verbs (형용사) act like English adjectives + the verb “to be.”
You don’t need a separate copula (like 이다). 크다 itself means “to be big,” so 커요 = “is big.”

Can I swap 공원이 and 식당보다, as in 식당보다 공원이 더 커요? Does it change the meaning?

Yes. Korean has flexible word order as long as you keep the particles attached.
식당보다 공원이 더 커요 is grammatically correct and means the same thing.
Swapping them can shift the emphasis: starting with 식당보다 highlights the comparison target.

What’s the difference between using -보다 and 에 비해(서) for comparisons?

Should 보다 be attached directly to 식당 or written separately as 식당 보다?

Standard Korean spacing rules attach particles directly to the preceding noun with no space.
Therefore, write 식당보다, not 식당 보다.

Can we replace -이/가 in 공원이 with the topic marker -은/는 to say 공원은 식당보다 더 커요?

Yes. 공원은 식당보다 더 커요 is perfectly correct.
-은/는 marks the topic and often introduces a general statement or contrast.
-이/가 in the original is more about focusing on the park itself as the subject.