Someone takes a toy that is not theirs. Someone breaks a window on purpose. Someone tells a big lie.
Those are crimes. Today we learn four words.
“Crime,” “criminal,” “criminally,” and “criminology.”
Each word shares the idea of breaking the law. Each does a different job.
Parents and children can learn these words together. They help with safety and justice.
What Does “Same Word, Different Forms” Mean?
One idea takes different shapes. The idea here is doing something illegal or wrong.
“Crime” is a noun. “Stealing is a crime against others.” Act.
“Criminal” is a noun. “The police caught the criminal.” Person.
“Criminal” is also an adjective. “Criminal behavior has consequences.” Describes.
“Criminally” is an adverb. “He acted criminally when he stole the car.” Describes a verb.
“Criminology” is a noun. “Criminology studies why people commit crimes.” Study.
Same root. Different endings. Different jobs. The law-breaking stays.
Personal Pronouns Change Their Form
Pronouns change for grammar. “I” becomes “me.” “They” becomes “them.”
Our words change for role and description. “A crime was reported.” Act.
“The criminal went to court.” Person. “He acted criminally.” How he acted.
“Criminology is fascinating.” Field of study.
Pronouns help us speak faster. Word families help us talk about rules and consequences.
When children know these four words, they understand why laws exist.
From Verb to Noun to Adjective to Adverb – One Family, Many Words
“Crime” is a noun. “Littering is a minor crime in some places.” Act.
“Criminal” is a noun. “The criminal served time in prison.” Person.
“Criminal” is also an adjective. “Criminal intent means you planned to do wrong.” Describes.
“Criminally” is an adverb. “He was criminally negligent.” Describes a verb.
“Criminology” is a noun. “Criminology uses science to understand crime.” Academic field.
We have no verb in this family. “Criminalize” is a verb but not in keywords.
Five members. One adjective/noun (criminal), one adverb, two nouns.
One Root, Many Roles – How Words Grow from Actions to Qualities
The root “crime” comes from Latin “crimen,” meaning judgment or accusation.
From that root, we add “-al” to make an adjective or noun. “Criminal” means related to crime (adj.) or one who commits crime (noun).
We add “-ally” to make an adverb. “Criminally” means in a criminal way.
We add “-ology” to make a noun meaning “the study of.” “Criminology” is the study of crime.
Help your child see this pattern. Crime is the act. Criminal is the person or description. Criminally tells how. Criminology is the science.
Same Meaning, Different Jobs – Is It a Verb or a Noun?
Look at “criminal.” It can be a noun or an adjective.
“The criminal ran away.” Noun. “Criminal behavior is wrong.” Adjective.
“Crime” is always a noun. “Crime hurts communities.”
“Criminally” is always an adverb. “She was criminally charged.”
“Criminology” is always a noun. “He majored in criminology.”
Teach children to look at the endings. “-al” can be adjective or noun. “-ally” adverb. “-ology” noun (field of study).
“Crime” alone is noun.
Adjectives and Adverbs – When Do We Add -ly?
We add “-ly” to “criminal” (the adjective) to make “criminally.” This is the rule.
Adjective + ly = adverb. “Criminal” + “ally” (spelling change: criminal + ly = criminally – but it adds “ally” not just “ly”).
Actually, “criminal” ends with “al.” Add “ly” → criminally. Yes.
Example: “He acted criminally.” Means he broke the law.
We do not add “-ly” to “crime” or “criminology.”
For children, “criminally” is advanced but good to know.
Watch Out for Tricky Spelling Changes (Double Letters, y to i, and More)
Spelling has one small note. “Criminal” ends with “al.” Add “ly” to make “criminally.” Double the “l”? No. Criminal + ly = criminally. One “l” from criminal, one “l” from “ly” gives two “l”s. Yes, “criminally” has double “l” (lli).
“Crime” adds “inal” to make “criminal”? That is not a simple add. Better to memorize.
“Criminology” has “ology” at the end.
No y to i changes.
Practice with your child. Write “crime.” Then “criminal.” Then “criminally.” Then “criminology.”
Notice the family resemblance.
Let’s Practice – Can You Choose the Right Form?
Try these sentences. Fill in the blank with crime, criminal, criminally, or criminology.
Stealing a wallet is a _____. (noun, act)
The _____ was arrested by the police. (noun, person)
He acted _____ when he lied under oath. (adverb)
_____ is the study of why people break the law. (field of study)
_____ behavior can lead to prison time. (adjective)
The study of _____ includes psychology and sociology. (field)
The _____ was found guilty by the jury. (person)
She was _____ prosecuted for the theft. (adverb)
Answers: 1 crime, 2 criminal, 3 criminally, 4 Criminology, 5 Criminal, 6 criminology, 7 criminal, 8 criminally.
Number 4 starts with a capital letter because it begins the sentence.
Number 5 uses “criminal” as an adjective describing behavior.
Tips for Parents – Help Your Child Learn Word Families in a Fun Way
Talk about rules. “Breaking a rule can be a crime if it is a law.”
Explain criminals simply. “A criminal is someone who breaks the law.”
Use “criminally” for emphasis. “It is criminally wrong to steal.”
Introduce criminology as “the science of crime. Detectives study it.”
Play a game. “Is this a crime or not? Taking a pencil from school?” (It is stealing, so yes – a small crime.)
Read a child-friendly mystery book. “Detectives solve crimes.”
Watch a cartoon where the bad guy is caught. Discuss.
Do not correct every mistake. If your child says “crimal” for “criminal,” gently say “Criminal.”
Celebrate when your child uses “criminology.” That is a big, impressive word.
Explain that laws keep people safe. Criminology helps understand why people break laws.
Tomorrow you might read about a crime in a story. You will learn about criminal justice. You will not act criminally. You will be curious about criminology.
Your child might say “Taking a cookie without asking is a crime in our house!” You will smile.
Keep teaching right from wrong. Keep explaining crime. Keep using criminal correctly. Keep exploring criminology together.
Your child will grow in language and in understanding of justice. Laws protect us. Words explain them.
