Use one apostrophe-S for each thing or group of things to show ownership. | 300 Days of Better Writing
Most people are familiar with using an apostrophe-S to show possession. Consider this sentence. “Bob’s dog is old.” In this sentence, Bob owns or possesses the dog. Simple. Where this gets tricky, however, is when you have multiple owners of multiple things. Let’s say that Bob and Mary each have one cat and that those…
