Formal:
* 学中文 (xué zhōngwén) - This is the most common and literal translation, meaning "to learn Chinese language."
* 学习汉语 (xuéxí hànyǔ) - This is a more formal and academic way to say it, literally meaning "to study the Chinese language."
Informal:
* 学汉语 (xué hànyǔ) - This is a more casual version of "学习汉语," still meaning "to study Chinese."
* 学中国话 (xué zhōngguó huà) - This means "to learn Chinese speech," and is a more informal and colloquial way to say it.
Other:
* 学中文/汉语 (xué zhōngwén/hànyǔ) - You can simply say "learning Chinese/Mandarin" depending on the specific variety of Chinese you're learning.
Example:
* 我在学中文。 (Wǒ zài xué zhōngwén.) - I am learning Chinese.
The choice of which phrase to use depends on the situation and your personal preference.