This is the 6593rd most frequent Korean word.
외국인들이
"Foreigners."
In this sentence, '외국인들이' refers to the subject of the sentence, identifying foreigners as the group of people liking Korean food.
외국인들이 한국 음식을 좋아한다.
Foreigners like Korean food.
Here, '외국인들이' signifies the group being referred to in the context of the inquiry about language learning difficulties.
외국인들이 배우기 어려운 언어는 무엇일까요?
What is a language that foreigners find difficult to learn?
This sentence uses '외국인들이' to specify the group associated with the school, indicating its connection to the foreigners.