I am so happy to have you!
You are my happiness!
Having you is my biggest happiness!
看看那个比较好。
英语倾向于名词性构句.
you are my happiness.
这句话翻译成中文是 你是我的幸福. 会更符合英语的习惯一点.
如果按照你的原文直译可以说I feel happy with you.
I‘m so happy because of you！
Because of you,I'm very happy
It's very happy for me to have you
都可以的
Because of you,I'm very happy.
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