Informal:
* 嗨,朋友! (Hi, friend!)
* 你好,朋友! (Hello, friend!) - This is more polite than just "嗨"
* 朋友,你好! (Friend, hello!) - This is also a common way to greet a friend.
Formal:
* 您好,朋友! (Good day, friend!) - This is a more formal greeting.
* 朋友,您好! (Friend, good day!) - This is another formal way to greet a friend.
More friendly:
* 你好,我的朋友! (Hello, my friend!) - This emphasizes that you consider the person a close friend.
* 朋友,我很好! (Friend, I'm good!) - This is a more conversational greeting, meaning "Hello, how are you?".
Important Note:
* Taiwanese is a dialect of Hokkien, so the pronunciation is different than Mandarin.
* The best way to say "Hello, my friend" in Taiwanese is to practice the pronunciation with a native speaker.
You can also use the phrase "你好嗎?" (How are you?) as a greeting. This is a versatile phrase that can be used in both informal and formal settings.