I am unsure if I can attend the meeting tomorrow.

我不确定明天是否能参加会议。

Molly : Sorry to say I am unsure, time will tell.

莫莉：很遗憾我还不能确定，看时间吧。

Billy: She wants to know if I know when it will be done. But I am unsure.

比利：她问我知不知道报告什么时候做好，可我还不能确定。

I am unsure how the blue coloration was developed and I also do not know how the orange eyes came about.

我不确定的蓝色斑纹和我还不知道怎么来的橙色的眼睛。