老师表扬了班长，说他做得很好。

Lǎoshī biǎoyáng le bānzhǎng, shuō tā zuò de hěn hǎo.

The teacher praised the class monitor and said he did very well.

老师让班长来收作业。

Lǎoshī ràng bānzhǎng lái shōu zuòyè.

The teacher asked the class monitor to collect the homework.

我们班的班长很热心，总是帮助同学。

Wǒmen bān de bānzhǎng hěn rèxīn, zǒngshì bāngzhù tóngxué.

The class monitor of our class is very warm-hearted and always helps classmates.