男の子

In a sentence

• その男の子は公園で遊んでいます。

  The boy is playing in the park.

  Here, '男の子' is used to refer to a male child in a general context.

• 私の弟は元気な男の子です。

  My little brother is an energetic boy.

  In this sentence, '男の子' is used specifically to describe a male child in terms of a familial relationship.

• 男の子がお母さんに花を渡しました。

  The boy gave flowers to his mother.

  This usage of '男の子' presents him as the subject of the action within the narrative context.