祝别人幸福应该怎么说英语

To wish someone happiness in English, you can say:

"I hope you have a happy and fulfilling life."
"I wish you all the happiness in the world."
"I hope you find joy and contentment in all that you do."
"I hope you have a wonderful and happy future."

You can also use shorter phrases, such as:

"I wish you happiness."
"I hope you're happy."
"Happiness to you."

It's always thoughtful to express your well wishes to others, and these phrases can help you do so in a sincere and friendly way.