This is the 6339th most frequent Korean word.
아들이
"아들이" means "son" in English.
In this sentence, '아들' (son) is followed by the subject marker '이', indicating that the son is the subject of the sentence.
아들이 학교에 갔어요.
The son went to school.
Here, '아들' (son) is again the subject of the sentence, emphasized by the subject marker '이'.
아들이 수업을 좋아해요.
The son likes the class.
In this statement, '아들' (son) serves as the subject, identified by the subject marker '이' to explain a characteristic about him.