Informal:
* 哈哈 (hā hā): This is the most common and informal way to express laughter. It's similar to "ha ha" in English.
* 嘿嘿 (hēi hēi): This is a slightly more playful and mischievous way to laugh.
* 呵呵 (hē hē): This is a softer and more polite way to laugh, often used in online chats.
Formal:
* 哈哈大笑 (hā hā dà xiào): This means "to laugh loudly". It's used in more formal situations.
* 轻声笑 (qīng shēng xiào): This means "to laugh softly".
* 微笑 (wēi xiào): This means "to smile". It can also be used to express a lighthearted chuckle.
Other:
* 噗嗤 (pū chī): This is a sudden burst of laughter, often used to express surprise or amusement.
* 咯咯 (gē gē): This is a giggling sound, often used by children or women.
* 嘿嘿嘿 (hēi hēi hēi): This is a more drawn-out and mischievous laugh.
Remember: The best way to express laughter in Chinese is to use the sound that feels most natural to you in the given situation. You can also use your body language and facial expressions to enhance the effect.
Have fun laughing in Chinese!