If you do not believe, try this. Say "Now". By the time you say "Now", you assume that the "Now" you just said is gone and you have to repeat saying "Now". Again, it is gone, and you have to keep repeating saying "Now" again.

You assume that every "Now" you mentioned has "flown" through time and become the "Past". And you assume that every moment is "Now". If every moment is now, what do you means by tomorrow? You have to agree that tomorrow will never come.