弟弟学习很认真

younger brother studies very diligently

→ 弟弟
phrase Rare #28,636
younger brother studies very diligently A possessive can come before 弟弟 to show whose younger brother is meant.
CH: 我弟弟学习很认真。
EN: My younger brother studies very diligently.

她弟弟学习很认真。

Her younger brother studies very diligently.

她的弟弟学习很认真。

Her younger brother studies very diligently.

他弟弟学习很认真。

His younger brother studies very diligently.

他的弟弟学习很认真。

His younger brother studies very diligently.