Informal:
* 哇 (wā) - This is the most common and versatile way to express "wow" in informal situations. It's often used to express surprise, amazement, or admiration.
* 哇塞 (wā sāi) - This is a slightly more exaggerated and playful way to say "wow". It's often used by young people or in casual settings.
* 我的天 (wǒ de tiān) - This literally translates to "My heavens!" and is used to express surprise or shock.
Formal:
* 真棒 (zhēn bàng) - This means "amazing" or "fantastic" and is a good way to express "wow" in more formal settings.
* 太厉害了 (tài lìhài le) - This means "so impressive" or "so amazing" and can also be used in formal situations.
The best way to choose the right expression depends on the context and your relationship with the person you're speaking to.