How do you use anniversary in a sentence?

Anniversary:

noun:
a. the annual return of the date of a special event; the date on which some event occurred in an earlier year.
b. a date that follows such an event by a specified period of time; the commemoration of such an event on that date in following years.


Example sentences:
  1. My grandparents celebrated their 50th anniversary.
  2. A special gift was given to my parents on their anniversary.
  3. The couple celebrated their anniversary on a yacht.
  4. September 1998 marks the anniversary of my dear beloved spouse who is no longer with us.

The prisoner marked of the first anniversary of his ten year sentence.