他们在用汉语聊天。

Tāmen zài yòng Hànyǔ liáotiān.

They are chatting in Chinese.

我想先学好汉语，再学别的语言。

Wǒ xiǎng xiān xuéhǎo Hànyǔ, zài xué biéde yǔyán.

I want to learn Chinese well first, then learn other languages.

你的汉语说得很好。

Nǐ de Hànyǔ shuō de hěn hǎo.

You speak Chinese very well.