Formal:
* 您好 (nǐ hǎo): This is the most common and polite way to say "hello" in Mandarin Chinese. It literally translates to "you good," and it's appropriate for most situations.
* 您早 (nín zǎo): This means "good morning" and is used when greeting someone in the morning.
* 您下午好 (nín xiàwǔ hǎo): This means "good afternoon" and is used when greeting someone in the afternoon.
* 您晚上好 (nín wǎnshàng hǎo): This means "good evening" and is used when greeting someone in the evening.
Informal:
* 你好 (nǐ hǎo): This is a more casual way to say "hello" and is suitable for friends and family.
* 嗨 (hāi): This is the most informal way to say "hello," similar to "hey" in English.
Other:
* 喂 (wèi): This is used to answer the phone or to get someone's attention. It's not technically "hello," but it functions similarly.
The best way to say "hello" in Chinese will depend on the situation and who you are talking to.