It's important to note that the question How are you? or What's up? doesn't necessary need a response. If you do respond, these phrases are generally expected:
注意：How are you?或What’s up?這兩個問題是不需要回答的。如果你要回答，可以使用這些短語。
How are you? / How are you doing?你好嗎?
Fine / Great (informal)不錯(非正式)
What's up?怎麼了?
Not much.沒什麼。
I'm just (watching TV, hanging out, cooking dinner, etc.)我只是在(看電視，出去玩，做晚飯等等)
Informal Greetings - After a Long Time
非正式問候——久別重逢
If you haven't seen a friend or family member for a long time, use one these informal greetings to mark the occasion.
Informal Greetings: Arriving
非正式問候語：到達
Hi / Hello你好
How are you?你好嗎?
How are you doing?你還好嗎?
What's up? (very informal)怎麼了?(非常隨意)
It's important to note that the question How are you? or What's up? doesn't necessary need a response. If you do respond, these phrases are generally expected:
注意：How are you?或What’s up?這兩個問題是不需要回答的。如果你要回答，可以使用這些短語。
How are you? / How are you doing?你好嗎?
Fine / Great (informal)不錯(非正式)
What's up?怎麼了?
Not much.沒什麼。
I'm just (watching TV, hanging out, cooking dinner, etc.)我只是在(看電視，出去玩，做晚飯等等)
Informal Greetings - After a Long Time
非正式問候——久別重逢
If you haven't seen a friend or family member for a long time, use one these informal greetings to mark the occasion.
如果你過了很久才見到意為朋友或家人，可以將下面的非正式問候語運用到該場合。
It's great to see you!見到你真好!
How have you been?你最近好嗎?
Long time, no see.好久不見。
How are you doing these days?你這段時間過得怎麼樣?