谢谢 (xiè xie)
This is a general expression of gratitude and can be used in most situations.
Here are some other ways to express gratitude in Mandarin:
* 感谢 (gǎn xiè) - This is a more formal way of saying "thank you".
* 非常感谢 (fēi cháng gǎn xiè) - This translates to "thank you very much".
* 多谢 (duō xiè) - This is a slightly more informal way of saying "thank you".
* 谢谢你的帮助 (xiè xie nǐ de bāng zhù) - This means "thank you for your help".
* 谢谢你 (xiè xie nǐ) - This means "thank you" directly to the person.
Remember that the tone and context can greatly affect the meaning of a phrase.