Question

What is oxen? Plural, singular, plural possessive, or singular possessive?

Answer 1

Hint: When a noun is a plural, it means that there are several instances of that noun.
A singular noun, such as 'standstill,' does not have a plural form and instead has a determiner in front of it, such as 'a' or 'the.' When there are multiple nouns, plural possessive nouns indicate ownership. Simply add a ‘s' to the end of a word to indicate ownership when there are several nouns.

Complete answer:
Adding a -s or –es to the end of a singular word creates the majority of plural forms. English, on the other hand, has both usual and irregular plural nouns. This rule (and others like it) apply to regular plurals, but irregular plurals aren't regular and don't obey a "normal" rule.
Example of a singular noun: one chair.
Example of a plural noun: chairs.

A singular noun is a noun that does not have a plural form and instead has a determiner in front of it, such as vicinity. If the singular noun ends in ‘s’ or not, the possessive of a singular noun is formed by adding an apostrophe and the letter ’s’. For instance, the T-shirt's logo. When a plural noun ends in ‘s’, the possessive is formed by adding only an apostrophe, and when it ends in a letter other than ‘s’, it is formed by adding both an apostrophe and an ‘s’. For example Alarms’ ringing. It's easy to use singular possessive nouns. All you have to do is add an 's’ if a person, location, or thing owns something.

In the above question, Oxen is the plural form of an ox. So, the correct answer is the plural form.

Note:
i) We add the plural suffix –s to most words, as previously stated:
   Cats are changed to Cats and similarly, Zebra is changed to Zebras.
ii) However, we add the plural suffix –es after the sounds s, z, sh, ch, and j:
   Class is changed to classes in its plural form and sash is changed to sashes
iii) Quizzes, for example, is a word that ends in z and has a double ending consonant.