Can a person sense when they are about to pass away?

Usually the person feels weakened, dizzy and disoriented before passing away. There are many conditions that precede passing away.

Unfortunately the person does not want to believe he/she is about to pass away, especially if she/he has not passed away before. So to recognise the signs one would need to have experienced the thing several times before.

So, the answer is 'yes they can, but usually they won't'