你怎么啦用英语怎么说三种

"What's up?" "What's going on?" "How are you doing?" are three common English expressions used to greet someone or ask how they are.

"What's up?" is a casual and informal way to greet someone and ask how they are doing. It's origin is thought to come from American hip-hop culture and is a shortened form of "What's happening?"
Example:
A: "What's up?"
B: "Not much, just hanging out. How about you?"

"What's going on?" is another casual way to greet someone and ask about their current situation. It's origin is unclear but it has been used in English for many decades.
Example:
A: "Hey man, what's going on?"
B: "Just trying to finish up some work. How about you?"

"How are you doing?" is a more formal way to ask about someone's well-being. It is a polite and common greeting in English.
Example:
A: "Hello, how are you doing today?"
B: "I'm doing well, thank you. How about you?"