Question

What is the proper use of the apostrophe with a singular possessive noun ending in "S"?

Answer 1

The possessive of singular nouns ending in s, including nouns ending in s, x, z, ch, or sh, is formed by adding 's, e.g. witness's affidavit. However, if the next word begins with s, then add only an apostrophe, e.g. witness' story.