You mix baking soda and vinegar. It fizzes. You learn something new.
That is an experiment. Today we learn four words.
“Experiment,” “experimental,” “experimentally,” and “experimented.”
Each word shares the idea of trying something to learn. Each does a different job.
Parents and children can learn these words together. They help with science.
What Does “Same Word, Different Forms” Mean?
One idea takes different shapes. The idea here is testing a hypothesis.
“Experiment” is a noun. “The science experiment was fun.” Test.
“Experiment” is also a verb. “We will experiment with colors.” Action.
“Experimental” is an adjective. “An experimental plane is new.” Describes.
“Experimentally” is an adverb. “The scientist worked experimentally.” Describes.
“Experimented” is a past tense verb. “She experimented with baking.” Past action.
Same root. Different endings. Different jobs. The testing stays.
Personal Pronouns Change Their Form
Pronouns change for grammar. “I” becomes “me.” “We” becomes “us.”
Our words change for role and time. “I experiment in the kitchen.” Present.
“The experiment worked.” Noun. “That is experimental.” Describes.
“He worked experimentally.” How. “We experimented yesterday.” Past.
Pronouns help us speak faster. Word families help us talk about discovery.
When children know these four words, they love science.
From Verb to Noun to Adjective to Adverb – One Family, Many Words
“Experiment” works as a noun. “The volcano experiment erupted.” Test.
“Experiment” also works as a verb. “Experiment with plant growth.” Action.
“Experimental” is an adjective. “An experimental drug is still being tested.” Describes.
“Experimentally” is an adverb. “He mixed the chemicals experimentally.” Describes.
“Experimented” is a past verb. “We experimented with sound waves.” Past action.
We have no other forms.
Five members. Essential for STEM education.
One Root, Many Roles – How Words Grow from Actions to Qualities
The root “experiment” comes from Latin “experimentum,” meaning a trial. From “experiri” (to try).
From that root, we add “-al” to make an adjective. “Experimental” means involving a test.
We add “-ly” to make an adverb. “Experimentally” means in an experimental way.
We add “-ed” for past tense.
Help your child see this pattern. Experiment is the test or action. Experimental describes the test. Experimentally tells how. Experimented means already tried.
Same Meaning, Different Jobs – Is It a Verb or a Noun?
Look at “experiment” in a sentence. Ask: Is it a test? Or is it an action?
“The experiment showed a result.” Test. Noun.
“We will experiment with clay.” Action. Verb.
Same word. Two jobs. Context tells you.
Now look at “experimental.” Always an adjective. “That is an experimental design.”
“Experimentally” is always an adverb. “The class worked experimentally.”
“Experimented” is always a past tense verb. “He experimented with recipes.”
Each form has one clear job.
Teach children that “experimental” means “not yet final.”
Adjectives and Adverbs – When Do We Add -ly?
We add “-ly” to “experimental” to make “experimentally.” This is the rule.
Adjective + ly = adverb. “Experimental” + “ly” = “experimentally.”
Example: “This is an experimental method.” Adjective. “We tested it experimentally.” Adverb.
We do not add “-ly” to “experiment” or “experimented.”
For children, “experimentally” is a precise word for science.
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.
“Experiment” adds “-al” to make “experimental.” Just add.
“Experimental” adds “-ly” to make “experimentally.” Just add.
“Experiment” adds “-ed” to make “experimented.” Just add.
No dropping. No vowel changes. Very clean.
Practice with your child. Write “experiment.” Add “al.” You get “experimental.” Add “ly.” You get “experimentally.” Add “ed.” You get “experimented.”
No tricks.
Let’s Practice – Can You Choose the Right Form?
Try these sentences. Fill in the blank with experiment, experimental, experimentally, or experimented.
Let us _____ with baking soda and vinegar. (action verb)
The science _____ was a success. (noun)
The _____ car is not yet for sale. (adjective)
The chemist worked _____, recording every result. (adverb)
She _____ with different paint colors. (past tense verb)
The _____ stage of the project is risky. (adjective)
We need to _____ before we draw a conclusion. (verb)
The scientist _____ with various temperatures. (past tense verb)
Answers: 1 experiment, 2 experiment, 3 experimental, 4 experimentally, 5 experimented, 6 experimental, 7 experiment, 8 experimented.
Number 2 uses “experiment” as a noun.
Number 4 uses “experimentally” as an adverb.
Tips for Parents – Help Your Child Learn Word Families in a Fun Way
Do a simple experiment. “Let us experiment with floating and sinking.”
Name the experiment. “Our experiment is to see what melts.”
Call a test experimental. “This recipe is experimental. We might change it.”
Work experimentally. “Add flour experimentally, a little at a time.”
Use past tense. “Yesterday, we experimented with slime.”
Play a game. You name a question. Your child designs a quick experiment.
“Do plants grow faster with music?” “I will experiment with two plants.”
Draw a lab coat. Write “experiment” on the pocket.
Read a book about science. “Ada Twist, Scientist” by Andrea Beaty.
Do not correct every mistake. If your child says “experiment” for “experimental,” gently say “The experiment is the test. The method is experimental.”
Celebrate when your child uses “experimentally.” That word sounds like a real scientist.
Explain that experiments can fail but teach us. “Even a failed experiment is not wasted.”
Tomorrow you will experiment with a new recipe. You will see an experimental design in a video. You will work experimentally to solve a problem. You will have experimented with many ideas.
Your child might say “I experimented with my toys and found a new game.” You will smile.
Keep experimenting. Keep designing experiments. Keep working experimentally. Keep learning from experimented ideas.
Your child will grow in language and in curiosity. Experimenting is how we learn. Words help us share the process.
