第一个问题答案是:To (某人)crazy(另外,说一句,第一句话会有不同答案是很正常的,因为没有名字,所以句式也难以确定,因为不同的名字有可能就会使句型改变)。第二个问题答案是:I don't understand why so many people are crazy about Li Yuchun
—————
you are crazy to someone.
be Crazy about somebody
be crazy about sb
are crazy to somebody