Formal:
* 您好 (nín hǎo): This is the most common and polite way to greet someone. It literally translates to "you good," and is used for addressing someone you don't know well or who is older than you.
* 久仰大名 (jiǔ yǎng dà míng): This means "long admire great name" and is a very formal greeting used when meeting someone you admire or respect.
* 久违 (jiǔ wéi): This means "long time no see" and is used when greeting someone you haven't seen in a while.
Informal:
* 你好 (nǐ hǎo): This is a more casual greeting, used for friends and family.
* 嗨 (hāi): This is a very informal greeting, similar to "hi" in English. It is often used among friends.
* 早上好 (zǎo shàng hǎo): This means "good morning" and is used in the mornings.
* 下午好 (xià wǔ hǎo): This means "good afternoon" and is used in the afternoons.
* 晚上好 (wǎn shàng hǎo): This means "good evening" and is used in the evenings.
Other:
* 你好吗 (nǐ hǎo ma): This means "how are you?" and is a polite way to greet someone.
* 最近怎么样 (zuì jìn zěn me yàng): This means "how are things recently?" and is a more casual way to ask how someone is doing.
Note: The choice of greeting will depend on the specific situation and the relationship between the speakers.