英语快乐怎么说英文怎么说

In English, we would say "happy" to describe someone who is feeling joy or contentment. Here are a few different ways to express this idea in English:
I'm feeling happy today.
She always looks so happy.
He's the happiest person I know.
They are a happy couple.
We had a happy childhood.
You can also use the adjective "cheerful" to describe someone who is happy and positive, or the adverb "happily" to describe how someone is behaving:
She's very cheerful.
He's always smiling and acting happily.
They walked into the party, happily chatting with each other.
I hope this helps! Let me know if you have any other questions.