她是一个用功的学生。

Tā shì yīgè yònggōng de xuéshēng.

She is a hardworking student.

这个班级的学生都很用功。

Zhège bānjí de xuéshēng dōu hěn yònggōng.

The students in this class are very diligent.

他从小就非常用功。

Tā cóngxiǎo jiù fēicháng yònggōng.

He has been very diligent since childhood.