as to

1concerningwith regard to至于(后接名词位于句首)

As to JackI believe he wouldn't have said anything like that.至于杰克,我相信他不会那么说的。

As to your final gradethat depends on your final examination.至于你的总成绩,那要根据你的期末考试而定。

2in connection with关于(后接句子)

They have not decided yet as to who will be in charge of the project.关于谁将负责这项工程,他们还没有作出决定。

He told me to phone him as to when I would leave.至于我什么时候离开,他让我打电话告诉他。