这些笔记对考试很有用。

Zhèxiē bǐjì duì kǎoshì hěn yǒuyòng.

These notes are very useful for the exam.

上课的时候要做好笔记。

Shàngkè de shíhou yào zuòhǎo bǐjì.

You should take good notes during class.

他的笔记写得很清楚。

Tā de bǐjì xiě de hěn qīngchu.

His notes are written very clearly.