I once taught at a small technical college in New York City. When teaching at a technical college, much to many adjuncts’ chagrin, you have to write all your own material, from the grading rubrics to the final exams. This also means a lot of administrative work, including copying, printing, paper-clipping, and the like.
Just so we’re clear, I’m not talking about fashion. Correct apostrophe use with possessives is something even the best grammarians need a reminder of from time to time. Let’s start with the basics:
The boy’s ball rolled into the water.
There is one boy and the ball that belongs to him rolled into a stagnant, murky creek.