I'm not sure yet还是I'm not sure either?如题,寻求原因

问题描述:

I'm not sure yet还是I'm not sure either?
如题,寻求原因

yet:至今还...
not yet:至今还没有...
sure:确定,肯定
I'm not sure yet.我至今还不确定.
either:也(用于否定)
I'm not sure either.我也不确定.