"The book is long."

Translation: 책이 깁니다.

[PALewis88]

아 에 이 오 우(가)
악 엔 임 온 웃 (이)

A good way to remember it is that the final consonant takes the place of ㅇ when pronouncing them

ex. 한국이 would sound like 한구기

[_MsLexi_]

What's the difference between having 이 at the end of a noun and 가 at the end?

[wintertriangles]

책 ends with a consonant, ㄱ, so it gets 이. 사과 ends with a vowel, ㅏ, so it gets 가.

[deactivated user]

I was wondering why. Thank you!

[Renee218134]

Same

[AK2RA]

long as in length and width? or long as in the story is long?

[wintertriangles]

The story. 가로 or 세로 or 길이 might have actual measurements associated with them.

[hizeus]

when do we use 그 and 그???

[kayla._.alyak]

It says the is 그 but 그 is never an option °ㅡ°

[slycordinator]

Even if the site/app says it "그" doesn't mean "the". 그 can mean "the" but it can also mean "that".

"그" is used for something closer to the person you're speaking to and farther away relative to you.

[AndieVelzq]

It said the answer was to put 을 at the end

[slycordinator]

The answer that the site accepts for this question doesn't contain "을" at all.

Also, 을/를 is the object marker and Korean grammar always places the object (if there is one) in the middle.