Writers frequently stumble when trying to form the possessive of a name ending in s, unsure whether to add just an apostrophe or an apostrophe followed by another s. This hesitation often stems from conflicting style guides and a fear of creating a grammatically incorrect or visually awkward word. The solution, however, is not a single rigid rule but a matter of balancing clarity, pronunciation, and adherence to a chosen style manual.
Understanding the Core Principle
The fundamental goal of a possessive apostrophe is to indicate ownership, signaling that something belongs to a person or entity. When the base noun already ends in s, the question becomes how to mark this ownership in a way that is both correct and easy to read. The primary debate centers on whether to write the possessive as a proper noun's singular form or to treat it as a plural noun, a decision that hinges largely on how the word is pronounced when spoken aloud.
The General Rule for Singular Names
For most singular names ending in s, the standard convention in American English is to add an apostrophe and an additional s ('s). This approach mirrors the formation of possessives for other singular nouns and ensures the spoken form is distinct. For example, "the witness's testimony" clearly denotes the testimony belonging to one specific witness. This rule applies to names like Charles, Thomas, and Moses, resulting in forms like the employee's report or the hostess's smile, which maintain a consistent pattern with other possessive singulars.
Exceptions and Style Variations
Not all style guides agree on this point, and some prominent sources, particularly in journalistic writing, recommend using only an apostrophe for singular proper names ending in s. According to this convention, you would write "the witness' testimony" or "the hostess' smile." While this method is visually cleaner, it can create ambiguity, especially when dealing with homophones or when the word is not pronounced with a sibilant ending. Therefore, writers must consider their audience and the specific style guide they are following, as consistency within a document is paramount.
Practical Application and Pronunciation
A helpful heuristic for deciding between "s'" and "'s" is to consider the word's pronunciation. If adding an extra syllable with an "eez" sound feels natural when speaking, use the apostrophe with an s ('s). For instance, saying "Marx's theory" aloud clearly requires the extra syllable, making the form preferable. Conversely, if the word ends in a hard z sound that does not require an additional syllable for clarity, such as in "eros," some writers opt for "eros' domain" to avoid the awkwardness of "eezeez."
Handling Plural Possessives
When the name is already plural and ends in s, the rule simplifies significantly. In this case, you only need to add an apostrophe after the existing s. This is because the plural form already signals that there is more than one entity. Examples include "the employees' lounge," "the cats' toys," and "the Joneses' vacation." The key is to first form the plural correctly and then add the apostrophe, ensuring the ownership is clear and the word remains easy to read.
Names with Irregular Plurals
A separate category of complexity arises with names that do not form their plurals by simply adding s. For a name like "children," the possessive form is "the children's playground," where the apostrophe follows the irregular plural. Similarly, for a name like "ox," the possessive of the plural "oxen" is "the oxen's yoke." These cases reinforce the principle that the apostrophe always follows the actual noun, whether that noun is singular or plural, regular or irregular.
