I can't tell you how happy I am.

我无法向你表达我多么高兴。

《牛津词典》

How happy I am to be able to thank you for what you have done, uncle!

大叔，能感谢您所做的一切，我是多么高兴啊！

youdao

I heard it on my happiest evening; but I did not then know how happy I was.

这是我在最幸福的一个晚上听到的。但那时我并不知道自己有多幸福。

youdao

Sometimes he seems to be saying, "I'm not happy about anything, but what are you going to do about it?"

VOA: special.2010.01.17

How happy I am with x dollars is called U.

我对于x美元的满意程度设为U

耶鲁公开课 - 金融市场课程节选

But I've had that for years and that's yeah, I like wearing it. It makes me happy.

我戴它很多年了，并且我喜欢戴着它。它让我很开心。

时尚让人兴奋 - SpeakingMax英语口语达人

"In the end I'm happy I didn't use too much energy and came through, " said Federer.

BBC: SPORT | Tennis | Nalbandian claims semi-final spot

"It was a tough weekend for us and I'm happy I could help Switzerland win, " said Federer.

BBC: Spain and Czechs through to final

And so I wrote "Struck By Lightning: The Carson Phillips Journal, " and am so happy I did.

CNN: STORY HIGHLIGHTS