The Complete Word Formula: Word Formation with Prefix, Root, and Suffix for Class 6

This Grade 6 worksheet takes word formation to the next level by teaching students how words are built using all three components — prefixes, root words, and suffixes — together. Students work with complex words like unacceptable (un + accept + able), postgraduate (post + graduate), impossible (im + possible), preshow (pre + show), unanswerable (un + answer + able), discomfort (dis + comfort), rewritten (re + written), unfairly (un + fair + ly), reusable (re + use + able), and unforgivable (un + forgive + able). Through five challenging activities — matching words to their breakdown, sorting words by suffix addition, fill in the blanks, multiple choice questions, and sentence rewriting — learners develop an advanced understanding of how multiple affixes combine with root words to create rich, layered vocabulary. The exercises are designed to move from simple identification to complex application, ensuring students can both analyse and create multi-affixed words with confidence. This worksheet is an outstanding resource for building advanced vocabulary, strengthening spelling accuracy, and preparing Grade 6 students for the word-formation challenges they will encounter in higher grades and competitive exams.

Why Word Formation (Prefix + Root + Suffix) Matter in Grammar?

Understanding how prefixes, root words, and suffixes combine is a powerful vocabulary-building strategy. For Grade 6 learners, mastering complete word formation is important because:
1. Complex words are formed by layering prefixes and suffixes onto root words, and recognising this structure helps students decode unfamiliar vocabulary.
2. Word formation is a key component of grammar and vocabulary sections in school exams, Olympiads, and competitive assessments.
3. The ability to break down and build words enhances both reading comprehension and creative writing skills.
4. Understanding word structure helps students spell complex words correctly and use them precisely in their own writing.

What's Inside This Worksheet?

This worksheet includes five grammar-rich activities that build advanced fluency with word formation:

Exercise 1 – Match Words to Their Breakdown
Students match each complete word on the left to its correct prefix + root + suffix breakdown on the right. For example, ""unhappy"" matches with ""un + happy,"" ""impossible"" matches with ""im + possible,"" ""preview"" matches with ""pre + view,"" and ""interaction"" matches with ""inter + act + ion."" This activity strengthens structural analysis of complex words.

Exercise 2 – Sort the Word Pairs
Students sort word pairs into Added Suffix and No Suffix categories. Pairs like fair/fairly, bold/boldly, tell/telling, help/helpful, and use/usable go under Added Suffix, while pairs like believe/belief, write/written, fair/unfair, and build/built go under No Suffix. This builds suffix-identification and classification skills.

Exercise 3 – Fill in the Blanks
Students choose the correct word with the right prefix and suffix combination to complete sentences. For example: ""Anjali found the new rule completely ___ (unaccept/unacceptable) for all students."" The correct answer is ""unacceptable."" This exercise strengthens contextual usage of multi-affixed words.

Exercise 4 – Multiple Choice Questions
Students pick the correct complex word from four options. For example: ""He acted very ________. a) unfairing b) unfairly c) unkind d) unkindly."" The correct answer is ""unfairly."" This sharpens quick recognition of correctly formed multi-affixed words.

Exercise 5 – Rewrite the Sentences
Students rewrite each sentence by correcting the wrongly formed prefix-suffix word. For example: ""Anjali said the rule was completely unaccept by all students."" becomes ""Anjali said the rule was completely unacceptable by all students."" This exercise builds editing and advanced word-formation accuracy skills.

Answer Key (For Parents & Educators)

Exercise 1 – Match Words to Their Breakdown
1. unhappy → un + happy
2. rewrite → re + write
3. impossible → im + possible
4. preview → pre + view
5. darkness → dark + ness
6. collection → collect + ion
7. enjoyable → enjoy + able
8. illegal → il + legal
9. postgraduate → post + graduate
10. interaction → inter + act + ion

Exercise 2 – Sort the Word Pairs
Added Suffix: fair/fairly, bold/boldly, tell/telling, help/helpful, kind/kindly, help/helpless, live/lively, use/usable, trust/trusted, do/doing, pack/packing
No Suffix: believe/belief, write/written, fair/unfair, build/built

Exercise 3 – Fill in the Blanks
1. unacceptable
2. postgraduate
3. impossible
4. preshow
5. unanswerable
6. definition
7. incomplete
8. uncomfortable
9. unusable
10. interaction

Exercise 4 – Multiple Choice Questions
1. b) unfairly
2. a) retelling
3. c) disbelief
4. b) unhelpful
5. d) rewritten
6. b) unkindly
7. d) reusable
8. d) displeasing
9. a) unforgivable
10. c) discomfort

Exercise 5 – Rewritten Sentences
1. Anjali said the rule was completely unacceptable by all students.
2. Rahul joined a postgraduate course after finishing school.
3. Diya found the maths sum very impossible for her to solve.
4. Pooja attended the preshow before the big annual concert.
5. Arjun said the question in the test was completely unanswerable.
6. Neha described the old road as very uncomfortable in the monsoon.
7. Kartik said his homework was undoable without a calculator.
8. Aarav said the traffic on Diwali was very uncontrollable in Delhi.
9. Rohan said the broken chair was very unusable in the class.
10. Anjali and Rohan built a strong interaction at their school project.

Unlock the secret to building complex words effortlessly with a Free 1:1 Word Formation Mastery Trial Class at PlanetSpark. Our expert educators guide students through prefixes, root words, and suffixes using fun, hands-on activities that make advanced vocabulary accessible and exciting.
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