What Does “Same Word, Different Forms” Mean? One root word can grow into four choice-making forms. “Decide, decision, decisive, decisively” share one meaning. That meaning is “to make up your mind.” Each form has a different job in a sentence. One word shows an action. One word names the choice you make. One word describes a firm person. One word tells how someone acts firmly. Learning these four forms builds confidence in making choices.
Personal Pronouns Change Their Form This rule applies to pronouns like “you, your, yours.” But word families work the same way for other words. “Decide” is a verb. “Decision” is a noun. “Decisive” is an adjective. “Decisively” is an adverb. Each form answers a different question. What action? Decide. What thing or choice? Decision. What kind of person or action? Decisive. How is something done? Decisively.
From Verb to Noun to Adjective to Adverb – One Family, Many Words This family starts with the verb “decide.” You decide which game to play. You decide what to eat for breakfast. From “decide,” we make the noun “decision.” “Decision” names the choice you make. Example: “The decision to share was kind.” From “decide,” we make the adjective “decisive.” “Decisive” describes someone who makes choices firmly. Example: “A decisive leader picks a plan quickly.” From “decisive,” we make the adverb “decisively.” “Decisively” tells how someone acts with certainty. Example: “She decisively chose the red crayon.”
One Root, Many Roles – How Words Grow from Actions to Qualities Think of a child picking a book at the library. The child will “decide” which book to borrow. That is the verb. The book the child picks is the “decision.” That is the noun. A child who picks quickly is “decisive.” That is the adjective. The child walks “decisively” to the shelf and grabs it. That is the adverb. The root meaning stays “to make a choice.” The role changes with each sentence.
Same Meaning, Different Jobs – Is It a Verb or a Noun? “Decide” is always a verb. It shows the action of making a choice. Example: “Please decide what you want for dinner.” “Decision” is always a noun. It names the choice or the act of choosing. Example: “That was a smart decision.” “Decisive” is always an adjective. It describes a person or action that is firm and clear. Example: “A decisive answer ends the confusion.” “Decisively” is always an adverb. It describes how an action is done with certainty. Example: “The captain decisively steered the ship.” Same family. Different jobs.
Adjectives and Adverbs – When Do We Add -ly? “Decisive” becomes “decisively” by adding -ly. This is a simple and common pattern. Active becomes actively. Positive becomes positively. Definite becomes definitely. “Decisively” follows the same rule. The adverb describes actions done with firmness. Example: “He decisively closed the door and left.”
Watch Out for Tricky Spelling Changes (Double Letters, y to i, and More) “Decide” has no double letters. It ends with a silent “e.” When we add “-sion,” we drop the “e” and change the “de” to “ci”? Decide – drop “de” – add “ci” – then “sion”? Better: decide → decision. The “d” changes to “s”? No. The pattern is: decide – drop the “e” – add “ision” – decision. Yes: decide + ision = decision (the “c” stays soft). When we add “-ive,” we drop the “e.” Decide – drop “e” – add ive = decisive. When we add “-ly,” we keep “decisive” and add “ly.” Decisive + ly = decisively. A common mistake is writing “decision” with an “s” after the “c” (decission). The correct spelling has one “s” – decision. Another mistake is writing “decisive” with an “s” (decissive). The correct spelling has one “s” – decisive. Write slowly at first. Remember: decide, decision, decisive, decisively.
Let’s Practice – Can You Choose the Right Form? Try these sentences with your child. Fill in the blank with decide, decision, decisive, or decisively.
I need to _______ which shirt to wear today.
That was a difficult _______.
A _______ person does not change their mind often.
She _______ walked to the front and spoke up.
Can you _______ between pizza or pasta?
The _______ to move to a new city was big.
His _______ action saved the game.
The cat _______ jumped onto the highest shelf.
Answers:
decide
decision
decisive
decisively
decide
decision
decisive
decisively
Go through each answer slowly. Ask your child why the word fits. Praise effort and confident thinking. Keep practice short and firm.
Tips for Parents – Help Your Child Learn Word Families in a Fun Way You can teach “decide, decision, decisive, decisively” through daily life. Use small choices, games, and routines.
At breakfast, say “Please decide what cereal you want.” Ask “What action are you doing?”
When you make a plan, say “We made a decision to go to the park.” Ask “What is a decision?”
When your child picks quickly, say “That was a decisive choice.” Ask “What does decisive mean?”
When your child acts with confidence, say “You acted decisively.” Ask “How is decisively different from decisive?”
Play a “pick it” game. Write the four words on sticky notes. Say a sentence. Let your child hold up the correct word. Example: “Decide now.” Child holds “decide.” “Good decision.” Child holds “decision.” “She is decisive.” Child holds “decisive.” “He acted decisively.” Child holds “decisively.”
Draw a four-part poster. Write “decide” with a picture of a person thinking between two doors. Write “decision” with a picture of a checkmark on a choice. Write “decisive” with a picture of a firm handshake. Write “decisively” with a picture of a person walking straight ahead. Hang it on the wall.
Use a “quick choice” game. Give two options. Say “Decide in three seconds.” After, say “You were decisive!” or “You decided decisively.”
Keep each session under five minutes. Repeat games on different days. Children learn through playful choosing and confidence.
When your child makes a mistake, smile. Say “Good try. Let me show you again.” Use the correct word in a simple sentence. Then continue.
No need for grammar drills. No need for tests. Just warm examples and real decisions every day. Soon your child will master “decide, decision, decisive, decisively.” That skill will help them make choices, stand by them, and act with confidence.