When it comes to using apostrophes with names ending in "s", there are a few different rules to follow depending on the situation: For singular nouns or names that end in "s", add an apostrophe and "s" to indicate possession. For example, "James's book" or "the boss's office". For plural nouns or names that end in "s", you must place an apostrophe after the "s" to indicate possession. For example, "the Joneses' car" or "the students' project" For names or nouns that are both singular and plural (e.g. "species" or "deer"), add an apostrophe and "s" to indicate possession. For example, "the species' habitat" or "the deer's tracks".