Plural nouns
02
referring to more than one thing, e.g., "cats", "books"
Zero plural
03
referring to a group of things without a plural form, e.g.,
"people", "fish"
They
used as the subject or object of a verb to express a group of people, or in place of a subject pronoun when the gender is unknown or insignificant.
The possessive case of nouns
Formation
adding "-'s" or "'s" to the end of the noun, e.g., "cat's", "dog's"
Usage
indicating ownership or possession, e.g., "the cat's food", "my brother's car"
used as the subject or object of a verb to express any person, thing, or idea without specifying which one.
used as the subject or object of a verb to express every single person, thing, or idea in a group without exception.
