至于他的成绩，我觉得还不错。
zhìyú tāde chéngjì ， wǒ juéde huán bùcuò 。
As for his grades, I think they are quite good.
至于明天的计划，我们可以再讨论。
zhìyú míngtiān de jìhuá ， wǒmen kěyǐ zài tǎolùn 。
As for tomorrow's plans, we can discuss it again.
至于他是否来到，我就不太清楚了。
zhìyú tā shìfǒu láidào ， wǒ jiù bùtài qīngchǔ le 。
As for whether he came, I am not very clear about it.