这些都是汉语里常用的词。

Zhèxiē dōu shì Hànyǔ lǐ chángyòng de cí.

These are all commonly used words in Chinese.

这是一本常用汉字的练习本。

Zhè shì yì běn chángyòng Hànzì de liànxíběn.

This is an exercise book of commonly used Chinese characters.

老师给我们介绍了一些常用的学习方法。

Lǎoshī gěi wǒmen jièshào le yìxiē chángyòng de xuéxí fāngfǎ.

The teacher introduced some commonly used study methods to us.