If you want to send some writers into a panic, ask them to spell the plural of crisis. You’ll get a lot of strange answers, from crisises to crisese.

Alas, the plural of crisis is crises. All you have to do is change the last i to an e.

Usually when a noun ends in s, you have to add an es to get its plural form. When a noun with Greek root ends in is, however, those two letters are changed to es to get a plural form.

So, there’s no need to call out the National Guard. Just remember the simple is>es rule, and you’ll have it all under control.

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My name is Rob Bignell. I’m an affordable, professional editor who runs Inventing Reality Editing Service, which meets the manuscript needs of writers both new and published. I also offer a variety of self-publishing services. During the past decade, I’ve helped more than 300 novelists and nonfiction authors obtain their publishing dreams at reasonable prices. I’m also the author of the 7 Minutes a Day… writing guidebooks, four nonfiction hiking guidebook series, and the literary novel Windmill. Several of my short stories in the literary and science fiction genres also have been published.