根据《牛津高阶词典》，没有be happy to somebody这样的搭配，happy后加somebody，中间的介系词应当用for。来看《牛津高阶英汉双解词典》上的例句：I'm very happy for you. 我真为你感到高兴！
这里可以再看一下形容词happy后常跟的一些介词搭配：
① be happy about something/be happy about doing something
例句：He is happy about his promotion.
I wasn't very happy about meeting her again.
② be happy at something/be happy at doing something
例句：be happy at the news
I am happy at hearing that ...
③ be happy for doing something
例句：You will be happier for making this decision.
④ be happy over something
例句：She was happy over her experience in Paris.
⑤ be happy with something/be happy with somebody
例句：I am not very happy with his proposal.
He is happy with his wife.
happy后可以跟to do不定式：be happy to do something；
例句：We are happy to announce the engagement of our daughter.
也可以跟从句：be happy that ...
介词搭配、动词词组、习惯用法等都是中国学生学习英语时的重点、难点。学习时一定要多积累、多感悟。这将事关您以后能不能写出准确、漂亮、地道的英语哦！