你喜欢一个人时,世界都是一封情书。When you like a person, the world is a love letter.
If you go away, I'll be blue. I'll miss you when you leave. 假如你走了,我会很沮丧. 你离开,我会很想念.
You're the only man/woman I could be happy with.(这句话是不是太夸张?)
I'm so happy with you in this starry night.在这繁星闪烁的夜晚,跟你在一起非常快乐.