Last week in this column we talked about some difficult possessives. This week, Bill in Williamsport, Pa., builds on that discussion with a question about a possessive issue we didn’t cover: “Joe is a ...

First, the possessive pronouns "theirs, his, hers, ours, its, yours" have no apostrophes. Second, all other possessive words do have apostrophes, as in "Joe's cat." ...