Fourth Grade English: Possessive Pronouns & Adjectives

When we communicate who owns a jacket, who solved a challenging math puzzle, or whose dog is barking in the yard, we rely on possessive words. English uses two distinct types of possessive words: possessive adjectives, which sit directly in front of a noun to describe it, and independent possessive pronouns, which stand entirely on their own to replace a noun. Learning the difference between these two forms and avoiding unnecessary apostrophes is an essential fourth-grade milestone.

Two Ways to Show Ownership

Possessive words are divided into two categories based on how they appear in a sentence.

+-----------------------------------------------------------------------+
|               POSSESSIVE ADJECTIVES VS. POSSESSIVE PRONOUNS           |
+-----------------------------------------------------------------------+
| Person       | Possessive Adjectives (With Noun) | Possessive Pronouns|
|              | (modifies a following noun)       | (stands alone)     |
+--------------+-----------------------------------+--------------------+
| 1st Person   | my (my desk)                      | mine (It is mine)  |
|              | our (our project)                 | ours (It is ours)  |
| 2nd Person   | your (your backpack)              | yours (It is yours)|
| 3rd Person   | his (his coat)                    | his (It is his)    |
|              | her (her drawing)                 | hers (It is hers)  |
|              | its (its tail)                    | [not used alone]   |
|              | their (their house)               | theirs (It is ...) |
+-----------------------------------------------------------------------+

Possessive Adjectives (Determiners)

A possessive adjective always comes directly before a noun. It does not replace the noun; instead, it modifies it by telling whose it is. In the sentence "That is my dog," the word "my" is a possessive adjective describing "dog." In "Their team won first place," the word "their" describes "team."

Independent Possessive Pronouns

An independent possessive pronoun replaces the noun phrase entirely. It stands alone as a subject, object, or complement without any noun following it. In the sentence "That dog is mine," the word "mine" stands alone and replaces the entire phrase "my dog." In "Ours is the blue tent," "ours" replaces "our tent."

The Golden Rule: No Apostrophes in Possessive Pronouns

Unlike possessive nouns (which use apostrophes like "Sarah's book" or "the dog's ball"), possessive pronouns and possessive adjectives NEVER use an apostrophe.

+-------------------------------------------------------------+
|              THE APOSTROPHE PITFALL IN POSSESSIVES          |
+-------------------------------------------------------------+
|  CORRECT (Possessive)           |  INCORRECT (Never use!)   |
|  yours                          |  your's                   |
|  hers                           |  her's                    |
|  ours                           |  our's                    |
|  theirs                         |  their's                  |
|  its (its paws)                 |  it's (this means IT IS!) |
+-------------------------------------------------------------+

The Crucial Difference: "Its" vs. "It's"

One of the most frequent errors in English writing is confusing "its" and "it's":
- "Its" (without an apostrophe) is a possessive adjective showing ownership: "The robin fed its chicks."

- "It's" (with an apostrophe) is a contraction meaning "it is" or "it has": "It's raining outside today."

- Test Rule: Whenever you write "it's," say "it is" out loud. If "it is" makes sense in the sentence, use the apostrophe. If "it is" sounds ridiculous, remove the apostrophe!


Side-by-Side Sentence Transformations

Converting sentences between possessive adjectives and possessive pronouns helps reinforce their functions.

+-----------------------------------------------------------------+
|                  TRANSFORMATION MENTOR MODELS                   |
+-----------------------------------------------------------------+
| With Possessive Adjective       | With Possessive Pronoun       |
+---------------------------------+-------------------------------+
| This is my locker.              | This locker is mine.          |
| Those are your shoes.           | Those shoes are yours.        |
| We found her keys.              | The keys we found were hers.  |
| Is that our bus?                | Is that bus ours?             |
| These are their sleeping bags.  | These sleeping bags are theirs.|
+-----------------------------------------------------------------+

Examining "His" and "Its"

Notice that "his" has the same form whether it acts as a possessive adjective ("his pencil") or an independent possessive pronoun ("The pencil is his"). The word "its" is only used as a possessive adjective ("its fur"); English speakers rarely use "its" alone at the end of a sentence.

Practice Exercises

Practice Questions

  1. Identify the possessive adjective in this sentence: "The astronaut adjusted her helmet before stepping onto the moon."
  2. Identify the independent possessive pronoun in this sentence: "You borrowed my eraser, but that one on the floor is yours."
  3. Choose the correct word in parentheses: "The puppy wagged (its / it's) tail when Jordan arrived."
  4. Rewrite the sentence using an independent possessive pronoun: "These are our binoculars."
  5. Correct the punctuation error: "The blue water bottle is her's, not their's."

Answer Key and Explanations

  1. "her" is the possessive adjective (it directly modifies the noun "helmet").
  2. "yours" is the independent possessive pronoun (it stands alone at the end of the clause).
  3. Correct word: "its" (without an apostrophe, indicating possession of the tail). "It's" means "it is," and "wagged it is tail" makes no sense.
  4. "These binoculars are ours." ("Ours" replaces "our binoculars" and stands independently).
  5. Corrected sentence: "The blue water bottle is hers, not theirs." (Possessive pronouns never take apostrophes).