"그의 누나와 그녀의 언니는 제일 친한 친구들입니다."

Translation: His older sister and her older sister are best friends.

[Knoebel_Joseph]

There are too many inconsistent translations.... One section you say I'm wrong for saying "best friends" and now you're saying I'm wrong for writing "closest friends" as you previous corrected me..............

[junhoon]

It's because of the 제일, which is like my first (best) close friend.

[lemonadx7]

Hints for "언니" show "sister" but no "older sister".

[AmandaStok10]

언니 is a female's older sister. 여동생 is for younger sisters.

[Woodsman72]

Maybe I'm not an expert in English, but this task frustrated me a lot...this is a piece of.... not a cake)
I was convinced that in English we have to use "the" + best. Why does Duo mark my answer as wrong whenever I use "the best" instead of only "best"????

[CGTokki]

Because you don't say "they are the best friends". You would say "they are best friends" or "they are the best of friends"...

[Eien19]

I can imagine saying that even if it's not correct...but thank you for your explanation because I was about to report it.

[alexis_lew1]

i had to resist the temptation to say that they were salty. don't give me that option Duolingo. it makes much funner sentences

[Zappy34]

Is "제일 친한 = the most familiar" wrong?

[listerine7]

i specified big sister and they said it was wrong this is such a mess

[lol95489]

Can someone break the sentence

[PaulHavig1]

I put "close friends" thinking that this is how it is used . . . I could be wrong, but is "best friends" the only possible meaning for this phrase?