to the end of a word to make a singular possesive (or sometimes a plural
possesive with words whose plurals do not end with S, such
as people) or a contraction with "is" or "has". Poorly-educated people/foreigners tend
to use it for plurals and verbs, but that usage
Bob's cat is black.
Bob's going to the store.
Bob's gone to the store to get his cat some
Cat's are fluffy
Bob has a cat that overeat's.