아이가

In a sentence

• 아이가 공원에서 놀고 있어요.

  The child is playing in the park.

  In this sentence, '아이가' is in the subject position and performs the action of playing.

• 엄마는 아이가 행복하기를 바래요.

  The mom wishes for the child to be happy.

  Here, '아이가' acts as the subject within a subordinate clause, representing who is to be happy.

• 나는 아이가 자라는 모습이 아름답다고 생각해요.

  I think the process of the child growing up is beautiful.

  In this construction, '아이가' is the subject of the subordinate clause describing the growing process.