There is nothing more important than good health反意疑问部分用is there还是is it,为什么？

因为有否定词nothing所以后面要用肯定形式.
is there是正确答案.

There is nothing more important than good health,is it?
这是特殊的反意思疑问句,得记住,由there be结构引导的句子的反意疑问句的主语要用it(单数时)或they(复数时)来代替there.特殊的反意疑问句还有好多，你可以去查阅语法书

There is nothing more important than good health，isn't it?
没有什麽比健康更重要了，对吧？

要用is there? 这是个固定的，记住就可以。