Question

I have yet to find the answer.= I have not as yet found the

Answer 1

I have yet to find the answer.跟I have not as yet found the answer.的意思是一样的,即“我还没有找到答案.”这两种说法都是正确的.

I have yet to find the answer.好像不是非主动的情况.你对“非主动”的定义是什么?

回答补充：

have yet to本意就是“还没（做）……”,所以可以引申为“还差……没做”,有这个意思.