Dictonary.com has a clarifying note on when to use which: assure, ensure, or insure (hint: “insure” is the only one having anything to do with insurance).
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Ellen Akins is the author of the novels Home Movie, Little Woman, Public Life, and Hometown Brew, and the short story collection World Like a Knife. She has published short stories in The Southern Review, The Georgia Review, The Missouri Review, and The Southwest Review, which (the last two) awarded her their biennial short fiction awards. Read more