yet 用在肯定句中

Question

Notably, he has yet to appear at the theater。是已经出现在theater了，还是还没有？
现在认为否定的人和认为是肯定的人是4比2，大家加油！希望在探讨中找到答案。

Answer 1

还没有。
used for saying that something has not happened or been done up to the present time, especially when you think it should have happened or been done。
表示认为应该做但尚未做的事。

参考资料：Macmillan English Dictionary for Advanced Learners

Answer 2

还没有出现，这是一种特殊用法，have/has yet to do相当于have/has not done sth yet

Answer 3

没有.
have yet to do something的意思就是还没有做某事.

Answer 4

yes, the answer should be he has already appeared at theater.
yet is the symble of present perfect, it means already.

Answer 5

yet做副词,在肯定句中一般表示"已经"或"更加".这一句是"已经".

参考资料：Testing And Evaluation(邮发代号8-315)2008年05期P31

Answer 6

值得注意的是，他至今 仍未 出现在战区