what's the difference between you and a person with proper grammar? A person with proper grammar never uses apostrophes to pluralize words.
one Jew :: two Jews
one car :: two cars
one CD :: two CDs
it's not that hard, folks. Let's do posession!
the money that belongs to the Jew :: the Jew's money
the money that belongs to the many Jews :: the Jews' money
the money that belongs to Mr. Burns :: Mr. Burns's money
the money that belongs to all the Burnses :: the Burnses' money
that was fun!!! Let's do contraction:
let us do contraction :: let's do contraction
it is beautiful outside :: it's beautiful outside
Dave is going to pick me up :: Dave's going to pick me up
Dave is going to pick me up in the car belonging to Mark :: Dave's going to pick me up in Mark's car