아들은

아들은

"아들은" means "son is" or "son" in the topic-marker context.

Here, '아들은' is used as the subject of the sentence, referring to 'the son'.

아들은 학교에 갔어요.

The son went to school.

In this context, '아들은' still serves as the subject, indicating 'the son' in preference expression.

아들은 축구를 좋아해요.

The son likes football.

Here, '아들은' is again used as the subject, highlighting a characteristic of 'the son.'

아들은 정말 똑똑해요.

The son is really smart.