Apostrophes can be tricky. Sometimes they form possessives. Sometimes they form contractions. Can they ever make something plural?
Apostrophe Use: Contractions and Omissions
A contraction is a shortened form of a word (or group of words) that omits certain letters or sounds. In a contraction, an apostrophe represents missing letters. The most common contractions are made up of verbs, auxiliaries, or modals attached to other words: He would=He’d.