You want a red shirt or a blue shirt. You pick the red one. You decide.
Today we learn four words. “Decide,” “decision,” “decisive,” and “undecided.”
Each word shares the idea of making a choice. Each does a different job.
Parents and children can learn these words together. They help with picking.
What Does “Same Word, Different Forms” Mean?
One action takes different shapes. The action here is choosing between options.
“Decide” is a verb. “Please decide which game to play.” Action.
“Decision” is a noun. “The decision to share was kind.” Choice.
“Decisive” is an adjective. “A decisive leader picks quickly.” Describes.
“Undecided” is an adjective. “I am still undecided about dessert.” Not chosen.
Same root. Different endings. Different jobs. The choosing stays.
Personal Pronouns Change Their Form
Pronouns change for grammar. “I” becomes “me.” “We” becomes “us.”
Our words change for role and description. “I decide now.” Action.
“The decision is final.” Noun. “She is decisive.” Describes.
“They are undecided.” Opposite.
Pronouns help us speak faster. Word families help us talk about choosing.
When children know these four words, they explain their preferences.
From Verb to Noun to Adjective to Adverb – One Family, Many Words
“Decide” is a verb. “Decide what to eat for lunch.” Action.
“Decision” is a noun. “That was a smart decision.” Choice.
“Decisive” is an adjective. “A decisive move wins the game.” Describes.
“Undecided” is an adjective. “The jury is still undecided.” Not chosen.
We have an adverb “decisively.” “She acted decisively.” But not in keywords.
Four members. Very useful for daily life.
One Root, Many Roles – How Words Grow from Actions to Qualities
The root “decide” comes from Latin “decidere.” “De-” means off. “Caedere” means to cut. To cut off other options.
From that root, we add “-ion” to make a noun. “Decision” means the result of deciding.
We add “-ive” to make an adjective. “Decisive” means able to decide quickly.
We add “un-” as a prefix to make the opposite. “Undecided” means not having decided.
Help your child see this pattern. Decide is the action. Decision is the choice. Decisive describes a quick chooser. Undecided means still thinking.
Same Meaning, Different Jobs – Is It a Verb or a Noun?
Look at “decide.” Always a verb. “Let us decide on a movie.” Action.
“Decision” is always a noun. “The decision was hard.” Choice.
“Decisive” is always an adjective. “A decisive answer ends the debate.” Describes.
“Undecided” is always an adjective. “We are undecided on paint color.” Describes.
No word plays two jobs. Each has one clear role.
Teach children to look at the endings. “-ion” noun. “-ive” adjective. “un- + decided” adjective opposite.
“Decide” alone is the verb.
Adjectives and Adverbs – When Do We Add -ly?
We add “-ly” to “decisive” to make “decisively.” This is an adverb.
“He acted decisively.” Means in a firm, quick way.
We do not add “-ly” to “decide,” “decision,” or “undecided.”
For children, “decisively” is advanced. Stick to the main words.
Watch Out for Tricky Spelling Changes (Double Letters, y to i, and More)
Spelling here is very regular. No double letters. No y to i changes.
“Decide” adds “-ion” to make “decision.” Drop the “e.” Decid + ion = decision. (Note: “d” becomes “s” in sound but spelling: decision.)
Yes, “decide” to “decision” changes the “d” to “s.” Decide → decision. That is a spelling change: final “d” becomes “s.”
“Decide” adds “-ive” to make “decisive.” Also change “d” to “s.” Decisive.
“Undecided” adds “un-” to “decided.” Keep “decided.” Un + decided = undecided.
So the rule: For “-ion” and “-ive,” change the final “d” of “decide” to “s.” For “undecided,” use “decided” from “decide” + “ed” (keep “d”).
Practice with your child. Write “decide.” Change “d” to “s,” add “ion.” You get “decision.” Change “d” to “s,” add “ive.” You get “decisive.” Write “un” in front of “decided.” You get “undecided.”
Let’s Practice – Can You Choose the Right Form?
Try these sentences. Fill in the blank with decide, decision, decisive, or undecided.
I cannot _____ between chocolate and vanilla. (action verb)
The _____ to move to a new city was big. (noun)
A _____ leader makes quick choices. (adjective)
The voters are still _____ about who to pick. (adjective)
Please _____ on a bedtime story. (action verb)
Her _____ answer ended the argument. (adjective)
What was the _____ of the committee? (noun)
He remained _____ even after hearing all the facts. (adjective)
Answers: 1 decide, 2 decision, 3 decisive, 4 undecided, 5 decide, 6 decisive, 7 decision, 8 undecided.
Number 4 and 8 use “undecided” as an adjective meaning “not sure.”
Number 3 and 6 use “decisive” as an adjective making quick choices or final.
Tips for Parents – Help Your Child Learn Word Families in a Fun Way
Make small decisions together. “Let us decide what to have for snack.”
Name the decision. “Our decision is apple slices.”
Praise decisive moments. “You were decisive when you chose the red cup.”
Respect undecided feelings. “It is okay to be undecided. Let us think more.”
Play a game. You give two options. Your child decides quickly.
“Milk or juice?” “Decisive: juice!”
Draw a fork in the road. Write “decision” at the junction.
Read a book about choosing. “The Little Red Hen” makes decisions.
Do not correct every mistake. If your child says “decisioned” for “decided,” gently say “We say decided for past tense.”
Celebrate when your child uses “undecided.” That word shows thoughtfulness.
Explain that “decisive” is usually positive. “It is good to be decisive, but only after thinking.”
Tomorrow you will decide what to wear. You will make a decision about a game. You will be decisive about a small thing. You might stay undecided about a big one.
Your child might say “I decided to be kind today.” You will hug them.
Keep deciding. Keep naming decisions. Keep being decisive when needed. Keep accepting undecided moments.
Your child will grow in language and in confidence. Choices shape our days. Words help us make them.
