Excuse me,where is the nearest bank,please?It`s not sure.对还是错

Excuse me,where is the nearest bank,please?It`s not sure.对还是错
Excuse me,where is the nearest bank,please?It`s not sure.对还是错

Excuse me,where is the nearest bank,please?It`s not sure.对还是错
Excuse me,where is the nearest bank,please?这些都对.
It`s not sure.这句错了.应该用 I am not sure【确定,主语经常用人而不用it】

不对，后面要说，I am not sure.不能是it.