Apostrophe Rules Made Simple: Contraction vs Possession Guide for Primary Kids
Fix the #1 error in Conventions of Language. Simple memory tricks to master singular possession, plural possession, and contractions like it's vs its with zero confusion.
The Single Most Common Error in Conventions of Language
In national NAPLAN marking reports, ACARA examiners consistently note that the misuse of apostrophes represents the single most frequent punctuation error among Australian primary students in Years 3, 5, and 7.
Students sprinkle apostrophes across plurals (writing "apple's for sale") or omit them entirely from possessives. Fortunately, apostrophes have only two jobs in the English language. Once a child learns to identify which job is being performed, apostrophe anxiety disappears.
Job 1: Contractions (The Missing Letter Detector)
A contraction occurs when two words are glued together to make speech faster. When letters are kicked out, the apostrophe acts as a placeholder showing where the missing letters once stood:
- do not becomes don't (the apostrophe replaces the 'o').
- she will becomes she'll (the apostrophe replaces 'wi').
- they are becomes they're (the apostrophe replaces the 'a').
The Rule: If no letters have been removed, an apostrophe cannot be used for a contraction!
Job 2: Possession (Who Owns What?)
Possession indicates ownership. To determine where the apostrophe belongs, teach your child to ask one simple diagnostic question: "Who owns the item?"
The 2 Ownership Rules
Rule A: One Owner (Singular Possession)
Write the owner first, then add 's:
- The dog owns the bone -> The dog's bone
- The teacher owns the pen -> The teacher's pen
- Maya owns the backpack -> Maya's backpack
Rule B: Multiple Owners Ending in S (Plural Possession)
Write the plural word first. If it already ends in 's', simply add the apostrophe after the s:
- Three dogs own three beds -> The dogs' beds
- All the teachers share a staffroom -> The teachers' staffroom
- Two sisters share a bedroom -> The sisters' bedroom
The Ultimate Test: "It's" vs "Its"
This single word pair causes more lost marks than almost any other in primary school. Teach your child this 5-second trick:
The Expansion Test:
Always read the sentence expanding the word into "it is".
• "The koala climbed up (it's / its) tree." -> Can you say "The koala climbed up it is tree"? No! That sounds ridiculous. Therefore, no apostrophe: its tree.
• "(It's / Its) raining heavily outside." -> Can you say "It is raining heavily outside"? Yes! Perfectly correct. Therefore, use the apostrophe: It's raining.
Quick 3-Question Practice for Dinner Time
Ask your child which is correct:
- The kangaroo jumped into (its / it's) pouch. (Answer: its)
- We went to visit our (grandparents' / grandparent's) farm. (Answer: grandparents' if two, grandparent's if one)
- (There's / Theirs) a possum in the gum tree! (Answer: There's, short for 'there is')
Frequently Asked Questions
Why does "its" not have an apostrophe when showing possession?
Because "its" is a possessive pronoun, just like "his", "hers", "ours", and "theirs". None of these possessive pronouns use apostrophes. An apostrophe in "it's" is exclusively used for the contraction of "it is" or "it has".
Where does the apostrophe go for plural words that do not end in s?
For irregular plurals that do not end in s (such as children, women, men, people, and mice), you treat them like singular words and add apostrophe-s (e.g. the children's playground, the women's race).
What is the "expansion test" for contractions?
Whenever you are unsure whether to write "it's" or "its", read the sentence aloud expanding the word to "it is". If "it is" makes sense in the sentence, use the apostrophe. If "it is" sounds wrong, use "its".