How do you say hello friend in Chinese?

There are a few ways to say "hello friend" in Chinese, depending on the context and level of formality:

Formal:

* 你好，朋友 (nǐ hǎo, péngyou) - This is the most common and polite way to greet a friend. It literally translates to "hello, friend."

* 朋友您好 (péngyou nín hǎo) - This is a slightly more formal way to greet a friend, especially if you are addressing someone older or in a position of authority.

Informal:

* 朋友，你好 (péngyou, nǐ hǎo) - This is a more casual way to greet a friend.

* 嗨，朋友 (hāi, péngyou) - This is a very informal and friendly way to greet a friend. It's similar to saying "Hey, friend!"

* 老朋友，你好 (lǎo péngyou, nǐ hǎo) - This is a way to greet an old friend, literally translating to "old friend, hello."

Note: "朋友 (péngyou)" can be used as a standalone greeting, similar to saying "Hey!" or "What's up?" to a friend.

The best way to choose which phrase to use is to consider your relationship with the person and the situation.