I have a question (that) how old you are?

问题描述:

I have a question (that) how old you are?
that到底有没有
how old you are应该是句同位语从句吧

是同位语从句,应该有that.
如果question前面是the,则不加that:
The question how old he is puzzles me.他多大了这个问题困扰着我.是同位语从句,有了how,为什么还要that啊?因为这里的question是泛指,所以question与how old you are的关系就不那么紧密了,这时我们可以把how old you are当作一个整体来看,而不要纠结它是由什么词引导的。这时用that是在两个同位语之间起个连接作用。